Stories tagged Flow of Matter and Energy

Oct
11
2010

Industrial hemp: Fields of green, etc, etc. Don't be tedious.
Industrial hemp: Fields of green, etc, etc. Don't be tedious.Courtesy Aleks
Oh, happy day! It was getting dry out there, Buzzketeers. I’m referring, of course, to the dearth of hilarious science news items; everything is extinction this, cancer that, radioactive this, greenish discharge that. If you wanted to write a clever and humorous article about scientific research, you’d have to lower yourself to making fun of oil-covered seabirds, or the stupid things babies do when they’re learning. Ugh.

But not any more, thanks to researchers at the University of Connecticut. By exploring the potential of industrial hemp to be a bio-fuel feedstock, they have opened up a plentiful new source of raw material for puns.

We could spend hours discussing how “green” the research is! Ha ha ha! Or, like, the high expectations scientists have for technology that can convert up to 97% of the oil from hemp seeds (a commonly discarded byproduct in hemp farming) into biodiesel. Ho ho ho ha!

Or what about this: there’s been a lot of… buzz surrounding biofuel production, because it could potentially remove food crops and high quality land from our food production system. But because hemp—which is typically grown for its fibers—can grow on relatively poor-quality land, it shouldn’t affect our production of munchies! Ha ha hahahahaaa!

It turns out that industrial hemp has a lot of applications, but it can’t be used as a drug! Ha ha… Oh, wait, I guess that wasn’t really a pun.

In any case, it’s illegal to grow industrial hemp in 41 states, so this one is probably just for other countries.

PS—Drug abuse isn’t any funnier than drug-related puns. Don’t yell at me.

Oct
07
2010

A bright future: We will all be armed skeletons, sitting on big piles of minerals. That's how I like to see it, anyway.
A bright future: We will all be armed skeletons, sitting on big piles of minerals. That's how I like to see it, anyway.Courtesy bredgur
According to a report in the journal Mineralium Deposita, there’s really no need for people to fight over mineral resources, because there are lots and lots of them left.

The report comes hot on the heals of a political snafu, in which a Chinese fisherman ran afoul of the Japanese coastguard, and China cut off shipments of rare earth metals to Japan, after the fisherman was arrested. Rare earth metals are vital for building electronics and hybrid electric cars, and China pretty much has most of the rare earth metals in town, so China was all, “You want your cars? Give us our fisherman.” Then Japan was like, “Oh, well, actually we can make hybrid cars without your stupid rare earth metals, so whatever.”

And everybody else started smacking their lunch trays on the tables and shouting, “Fight! Fight! Fight!”

But then Japan was like, “Fine. Just take your stupid fisherman. He’s a jerk anyway.” And China was like, “Fine, then!” And everything went back to normal. But it left the world thinking, are we going to have to tussle over stuff like this eventually? Everyone wants minerals, and we might be running out…

Not so, says Lawrence Cathles of Cornell University. We have lots of minerals, more than we could use in thousands of years, even with the whole world living at Western European material standards.

Aw, man. What can we fight about now? I suppose there’s always country and rock ‘n roll. Or we could all split up into Sharks and Jets. We could maybe start randomly accusing each other of cheating at Monopoly, regardless of whether or not we’ve been playing Monopoly.

But… I just can’t get worked up over that stuff. If I can’t throw down over a chunk of copper, or a pocketful of palladium, I don’t know that I even want to fight. Oh well. I might as well just finish reading that article…

So let’s see. The minerals Cathles is talking about come from the ocean floor. At points where the Earth’s crust is pulling apart, molten rock meets ocean water, infusing it with minerals and heating it. The hot seawater rises through the crust, and deposits precipitating minerals on the ocean floor. Lots and lots of copper, uranium, lithium, phosphate, potash, and on and on… all waiting for us in deposits on the ocean floor. A small percentage of the minerals that should be hiding out down there could keep humanity going for “50 centuries or more.”

Sweet! But… wait a second. Didn’t it just say that the minerals are sitting on the bottom of the oceans? Where the tectonic plates are pulling apart from each other, areas one might refer to as “ocean spreading centers.” Sooooo… the minerals are under the middle of the oceans.

Yes! We’re going to have something to fight over after all!

See, I think y’all remember what can happen when you’re trying to get at something on the bottom of the ocean… this sort of thing. And the depths of mid-ocean ridges are nothing to sneeze at. But deep sea oil drilling operations might be a good junior-league analogy for mid-ocean mining—it’s expensive and potentially extremely dangerous, but once we want that resource enough, we’re going to give it a shot. And once we do, that (fortunately!!!) won’t be the end of conflict over the resource. Drilling or mining areas will be disputed, as will environmental liabilities.

I mean, what do I know about it. But when has having enough of something for everybody ever kept people from being upset about it?

I find this to be a very hopeful report. Someday—maybe not soon, but someday—we’ll engage in high-tech, high risk, deepwater mining in international waters. And there will be fighting! Lots of fighting!

Oct
07
2010

What if I told you University of Minnesota geology and geophysics professor, Martin Saar, says geothermal energy can be made even greener through carbon sequestration?!

You’d probably say, “Huh?? Hold on, what is geothermal energy anyway, and how does it work?”

Geothermal is heat from deep inside the earth. Because heat is a form of energy, it can be captured and used to heat buildings or make electricity. There are three basic ways geothermal power plants work:

  1. Dry steam plants: Uses high-pressured hot steam to turn generator turbines. Think “steam to turbines.”
  2. Flash steam plants: Uses high-pressure hot water to create steam to turn generator turbines. Think “water to steam to turbines.”
  3. Binary cycle power plants: Uses high-pressure hot water to heat another liquid, which then turns to steam and turns the generator turbines. Think “water to other liquid to steam to turbines.”

(Click here for great diagrams of each of these geothermal energy production methods.)

“And what about carbon sequestration too? What’s that and how does it work?”
Carbon Sequestration: This nifty diagram illustrates both terrestrial and geologic carbon sequestration pathways.  Bonus!
Carbon Sequestration: This nifty diagram illustrates both terrestrial and geologic carbon sequestration pathways. Bonus!Courtesy Department of Energy

Carbon sequestration includes carbon (usually in the form of carbon dioxide, CO2) capture, separation, transportation, and storage or reuse. Plants, which “breathe” CO2, naturally sequester carbon, but people have found ways to do it artificially too. When fossil fuels are burned to power your car or heat your home, they emit CO2, a greenhouse gas partially responsible for global climate change. It is possible to capture those emissions, separate the bad CO2, and transport it somewhere for storage or beneficial reuse. CO2 can be stored in under the Earth’s surface or, according to Martin Saar’s research, used in geothermal energy production.

Alright. We’re back to Professor Saar’s research. Ready to know just how he plans to sequester carbon in geothermal energy production?

It’s a simple idea, really, now that you know about geothermal energy and carbon sequestration. Prof. Saar says geothermal energy can be made even greener by replacing water with CO2 as the medium carrying heat from deep within the earth to the surface for electricity generation. In this way, waste CO2 can be sequestered and put to beneficial use! As a bonus, CO2 is even more efficient than water at transferring heat.

But don’t take my word for it. Come hear Professor Martin Saar’s lecture, CO2 – Use It Or Lose It!, yourself during the Institute on the Environment’s Frontiers on the Environment lecture series, Wednesday, October 27, 2010 from noon-1pm.

Frontiers in the Environment is free and open to the public with no registration required! The lectures are held in the Institute on the Environment’s Seminar Room (Rm. 380) of the Vocational-Technical Education Building on the St. Paul campus (map).

Sep
23
2010

You might be aware of phosphorus, P, as a key ingredient in your lawn fertilizer. Or, perhaps you’ve seen “Does not contain phosphates” labels on your household detergents. If you haven’t seen these labels yet, chances are high you’ll see them soon. Why??

Phosphorus is Useful as Fertilizer and Detergent...

Fertilizer with P: See the N-P-K?  The P stands for phosphorus.  The number 21 below it tells us the percent of P in the fertilizer.  Many lawn fertilizers are now 0% P.
Fertilizer with P: See the N-P-K? The P stands for phosphorus. The number 21 below it tells us the percent of P in the fertilizer. Many lawn fertilizers are now 0% P.Courtesy Malawi MV project work

Phosphorus is a life-supporting mineral, which is why so many fertilizers contain it. Phosphates, the naturally occurring form of phosphorus, help soften water, form soap suds, and suspend particles making them choice detergents. Supporting life and keeping clean would normally be good things, but phosphorus has a dark side too.

... But, Phosphorus Causes Smelly, Dead Eutrophication

Because phosphorus is so good at growing stuff, it is actually harmful to the environment when it becomes dissolved and concentrated in bodies of water. Phosphorus-rich lakes cause algae blooms – huge increases of algae in a short period of time (kind of like the post-World War II Baby Boom, but for algae). Besides being smelly and turning water green, algae “breathe” the oxygen right out of the lake! Stealing dissolved oxygen even in death, algae create hypoxia – low oxygen, which prevents most other living things from surviving in the surrounding area. This whole process, from phosphorus-loading to algae bloom to hypoxia, is called eutrophication. There are other environmental and health risks to phosphorus, but eutrophication is what politicians are talking about around the water cooler these days.

Icky Algae Bloom: Algae blooms occur in nutrient-loaded water bodies and often led to hypoxia in a process called eutrophication.
Icky Algae Bloom: Algae blooms occur in nutrient-loaded water bodies and often led to hypoxia in a process called eutrophication.Courtesy Felix Andrews

Seventeen States Banned Phosphorus in Automatic Dishwashing Detergents

Deciding that euthrophication was yucky, in July, 17 states, including the entire Great Lakes Commission of which Minnesota is a member, passed laws banning phosphates from automatic dishwasher detergent. That might not seem like a big deal, but automatic dishwasher detergent is said to comprise between 7-12% of all the phosphorus making it into our sewage system (source). Previous legislation has limited or banned phosphorus in lawn fertilizers and laundry detergents.

Consumers Asked to Cope

According to a recent New York Times article, some consumers are getting their feathers ruffled as detergent manufacturers re-do their formulas to comply with state laws. The primary complaint is that the phosphate-free detergents don’t clean as well as traditional formulas. Consumer Reports concurred: of 24 low- or no-phosphate detergents tested, none matched the cleaning capabilities of detergents with phosphates. It may be uncomfortable at first, but learning to cope in a low-phosphorus world is already having environmental and human health benefits.

Green Cleaning: There are several line of green cleaning products that contain low- or no-phosphates.
Green Cleaning: There are several line of green cleaning products that contain low- or no-phosphates.Courtesy Becoming Green

Rest assured, industry officials still want your business and are continually improving their formulations. Indeed, the same Consumer Reports article mentioned above rated seven low- or no-phosphate detergents as “very good.” For the curious, there is a multitude of other websites reviewing phosphate-free detergents online. Pre-rinsing and/or post-rinsing have also been cited as ways to deal with phosphate-free dishwashing detergents.

Peak Phosphorus: Another Consideration

If you still aren’t convinced of the switch, consider this: we’re running out of phosphorus like we’re running out of oil. Phosphorus is a mineral, mined from naturally occurring phosphates, and we’re mining it faster than geologic cycles can replenish it. One Scientific American article cites the depletion of U.S. supplies in a few decades (world supplies may last for roughly another 100 years) given current consumption rates. Without phosphorus, world food production will plummet and with a global population soaring towards 9 billion people, that would be a very sorry state of affairs. If we succeed in limiting our phosphorus consumption, say, through eliminating it from household detergents, we may be able to continue using it in fertilizers and thus keep the human population fed well into the future.

What do you think? Is the phosphate-ban worth it?

Sep
22
2010

Last night, bkennedy, a couple other SMM staff members, and I attended the Bell Museum's Cafe Scientifique at Bryant-Lake Bowl in Minneapolis. Robert Twilley, a principal investigator with the National Center for Earth-Surface Dynamics, came to speak about the endangered environment of the Mississippi Delta and the BP Deep Horizon Oil Spill. I didn't expect to get a history lesson, but it's just this kind of broad-ranging perspective that will help us understand what is happening to our environment.

It was frustrating to hear Dr. Twilley recount how, as a result of the 1928 Flood Control Act, civil engineers literally remade the Mississippi River and its delta in response to severe flooding events. While this had the temporary effect of protecting area residents from flooding, the plan neglected an important quality of all coastlines: they're dynamic. As sea level has risen over the last century, diverted sediments no longer replenish key areas of the delta and vast stretches of wetland are drowning--the same stretches of wetland that would protect people in the event of a strong hurricane. As a result of the levees, regular floods no longer wash sediments into the area. To complicate matters, projects such as dams farther upstream have cut the overall sediment supply to the Mississippi by about 50 percent in the last couple centuries.

Dynamic Mississippi River Delta: The shaded areas of this image show how the river delta has shifted around over the last 4600 years.
Dynamic Mississippi River Delta: The shaded areas of this image show how the river delta has shifted around over the last 4600 years.Courtesy Urban

Twilley emphasized that it wasn't as if people didn't know the problems these strategies would cause; engineers who opposed flood control tried to call attention to the associated risks. But in the wake of disastrous floods, the public demanded visible public works projects and politicians wanted to please them. Engineers who supported flood control saw it as a noble enterprise to control nature and protect people. And so today we have a tricky situation in the delta area. Disasters increase in intensity, and with them, peoples' insistence on solutions grow. But Twilley cautioned that it is imprudent to act on impulse, especially due to a widespread lack of understanding about how coastal systems work, and to our tendency to favor human safety without consideration for the environment that supports our safety. In short, we undermine ourselves.

"Since 1932, the basin has lost approximately 70% of its total land area."
-lacoast.gov

When Hurricane Katrina hit, the same channel intended to give port access to ships funneled the storm surge farther inland. Twilley described how this perfect storm of civil engineering amplified the devastation brought by the Category 3 hurricane. The response to this devastation, rather than stepping back to reevaluate the situation and consider new ways to accommodate both the delta's needs and humans' needs, was to build a surge barrier that does nothing to restore the natural systems that once built and sustained that landscape over centuries. Contrary to engineers' intentions, Twilley asserted that these strategies will only exacerbate rising sea level and storm surge in the future as the wetlands drown further and the coastline moves inland.

Twilley also explained how, more recently, a lack of recognition of the complex systems in the river delta and along the Gulf Coast exacerbated BP's Deepwater Horizon Oil Spill. BP's front end study on the potential impacts of a spill found no cause for concern that the oil would reach the shore. And yet, in spite of booms placed along the coast, the oil did reach the shore, infiltrating wetlands already threatened by rising sea levels and weakened by lack of sedimentation. Thanks to the use of dispersants, the oil is difficult to find and we may not know the full impact of the spill for some time.

This paints a pretty grim picture of the future, but Twilley left us with cause for hope. In one of the areas to which a significant portion of sediment was diverted, the wetlands are actually growing (Atchafalaya). Twilley and his colleagues hope that this and other examples will demonstrate the importance of these natural wetland-building systems and garner support for their plain to mitigate the wetland loss. They want to add river outlets in strategically important places throughout the delta to rebuild the wetlands and help stabilize the landscape. These outlets would only operate during flooding episodes--an approach called controlled flooding (as opposed to the current strategy of flood control), siphoning off extra water and sediment to starved wetlands AND preventing flooding into human settlements. Currently, they're also involved in a project to pipe sediment to areas that need it.

Of course, the new outlet plan won't be without some compromise on the part of humans--some may have to relocate. But given projections of the area for 2100, relocation isn't far off anyway. And the long-term protective benefits of restoring the wetlands might just be worth it.

Sep
22
2010

NREL's membraine: There's so much science in his head it's projecting colorfully out into the air as a graph.
NREL's membraine: There's so much science in his head it's projecting colorfully out into the air as a graph.Courtesy NREL
You’re worried about the future again, aren’t you? You’re afraid that everything will taste like cardboard, and that most people will be robots, and that the robots will be too cool to hang with you, and that our trips to the bathroom with be confusing and abrasive, and something about bats, and that you will be hot all the time, even in your own homes.

And I wish I could tell you otherwise. But I can’t. I just don’t know enough about the future. Except on that last point—it looks like air conditioning may yet be an option in a necessarily energy efficient future.

Air conditioning can use up a lot of energy. An air conditioning unit typically cools air by blowing it over a coiled metal tube full of a cold refrigerant chemical. The refrigerant absorbs heat from the air in your house, and then it passes through a compressor, which squishes the refrigerant down, making it hot so that it releases heat outside your house. And then the refrigerant expands, and cycles back into the cool tube. (Here’s the explanation with some illustrations.)

Other cooling systems rely on evaporation. So called “swamp coolers” pull hot, dry air from outside, and blow it over water (or through wet fabric pads). The water evaporates to pull heat out of the air, so what is blown into your house is cool, humid air. Swamp coolers are more efficient, but they only work in very dry environments.

And then there’s another way to control your indoor climate: desiccant cooling. A lot of what makes warm air uncomfortable is the amount of moisture it can contain. Normal AC units remove moisture from the air, but they use a lot of energy in doing it. Another way is to use chemicals called desiccants. Desiccants suck up water. The little packs of “silica gel” crystals you might find in a new pair of shoes are full of desiccants. Blowing humid air over desiccants will result in the chemicals sucking the moisture out of the air, making it more comfortable.

Figuring out how to use the desiccants has been a challenge, however; desiccant chemicals can be corrosive to building materials, so they, and any dripping water, need to be contained. With this in mind, US government researchers at the National Renewable Energy Laboratory have developed a membrane for desiccant cooling systems that allows the water vapor in humid air to pass through it one way, but does not allow the liquid water removed from the air to pass back.

The researchers claim that this air conditioning process is up to 90% more energy efficient than standard AC. Every so often, the desiccant chemicals need to be “recharged” by heating them up so they release the trapped water (outside), a job that can be done by electric heating elements, or with a solar thermal collector. The University of Minnesota used a desiccant cooling system for their entry into the Solar Decathlon competition. Their system didn’t rely on a membrane—rather, humid air was pumped up through a drum of liquid desiccant—but they did recharge the desiccant using heat from solar thermal panels (which are basically big, flat, black boxes that collect heat from sunlight).

It’s reassuring to know that in the future, even as we’re covered in flesh eating bacteria, and spam advertisements for Spam are being beamed directly into our brains, we’ll at least be able to relax in pleasantly dry, cool air, without worrying too much about the energy we’re using to do it.

Aug
31
2010

This kid is sitting on a fortune!: That balloon will put him through college, assuming he doesn't blow it all first on candy and blackjack.
This kid is sitting on a fortune!: That balloon will put him through college, assuming he doesn't blow it all first on candy and blackjack.Courtesy Lars Plougmann
Y’all ever see Mad Max? Or Mad Max 2: The Road Warrior? Or even Mad Max 3: Beyond Thunderdome?

Some of you surely have, and I salute you. For the rest of you, the short description is this: a handsome young Australian actor, who we should just assume is now dead, played a lone wanderer, drifting across a post-apocalyptic wasteland. During the course of his adventures, he meets Tina turner, a really weird looking pilot (twice?!), a grunting, boomerang-throwing feral child, a man named Toe-cutter, and an awesome giant/little person team (sort of like Jordan and Pippen, but more inclined towards stranglings). It’s all very exciting! But the most important part of the Mad Max trilogy is this: he lives in a world without gas. Everybody was so busy blowing each other up that they forgot to be careful with their oil, so by the time Max rolls around, people are freaking out trying to get a few more drops of “the precious juice” for their dune buggies and flame throwers.

And so we come to our news item, and this afternoon’s future-dread focus: helium. If you look at the Mad Max summary and pretend “gas” refers to helium gas instead of gasoline, and if you replace “dune buggies” with “scanning equipment,” and “flame throwers” with “party balloons,” it’s a pretty decent analogy.

See, we’re running out of helium. And when it’s gone, it’s gone forever.

The above statement brings to mind two points (at least for me):
1) No we aren’t. Shut up.; and
2) Even if we are running out of helium, who cares? I can fill up my party balloons with air, or Cheesewhiz, or something.

If you read the article linked to above (or one of the many articles on the subject that came out last week), you’ll find that the answer to point 1 is, yeah, we kinda are, and the answer to point 2 is, it’ll be sad to see floating party balloons go, but they’re the least of our problems. It’s all dune buggies and flame throwers from here on out.

The problem is that helium is non-renewable. We talk about oil being non-renewable, but helium is even more non-renewable. See, helium only comes from fusion reactions (hydrogen atoms slamming together to form heavier helium), or from radioactive decay (heavier elements breaking apart at the atomic level to form lighter helium). Hydrogen fusion only happens in stars (scientists are trying to replicate it as an awesome source of nuclear energy, but don’t hold your breath), so all of the helium on our planet comes from underground, where gases from radioactive decay have become trapped.

We’ve got a nice big planet here, and we’ve got lots of helium, but we’ve just been farting it away, and once helium is released into the atmosphere, it’s gone to us for good. And we’re currently farting away helium at such a tremendous rate that the gas could be all but unavailable within a couple generations. The reason for this is that it’s actually official policy to fart away helium. (More or less.)

A huge portion of the world’s helium has been mined from the American Southwest, and for a long time we were actually pretty good at storing it—we pumped it back underground into a huge system of old mines, pipes and vats near Amarillo, Texas, in a facility called the US National Helium Reserve. We stored the helium because it was strategically useful to the country—it was vital for rocket operation during the Cold War. But in 1996, a law was passed requiring the helium to be sold off, all of it, and by 2015. I’m not totally clear on the reason for the law. I suppose the idea was that the Cold War was over, and by selling the helium, the US National Helium Reserve could be paid for (sort of a Gift of the Magi kinda thing, but whatever.) Congress, however, decided that the price of the sold helium would remain the same until it was all gone, so even as available helium became scarce, it would never be more expensive.

This broke the law of supply and demand, and having this vast, vast supply of helium go on sale for cheap meant that all the helium in the world had to be cheap too. Helium has become so cheap, in fact, that there’s no economic incentive for recycling it—recapturing it after use is so much more expensive than just buying new helium, people have just been letting the used helium drift away, where we’ll never be able to reclaim it. Normally, when a resource becomes more scarce, its price will go up, and people will be better about using it. (For an example, see gas prices and fuel efficiency in cars.) Not so with helium, thanks to that 1996 law. And pretty soon, say some scientists, we’ll be running out of the precious gas.

The “precious” part is there because helium is useful for a lot more than party balloons. (Although they’re ok too.) The properties of helium make it an excellent coolant for medical scanning equipment, and the sort of detectors used in super colliders. It’s also used in telescopes, diving equipment, rockets (NASA is a huge user—and waster—of helium), fusion research, and airships. (And don’t laugh about that last one—as the price of fuel goes up, the prospect of eventually moving cargo with lighter-than-air aircraft, like blimps and zeppelins, is becoming more likely. And hydrogen is a little bit too explodey to be a great alternative lifting gas.)

Helium is so desired, and is being wasted at such a rapid rate, claims Robert Richardson (a Nobel Prize-winning physicist, whose research was on helium), that a single helium-filled party balloon ought to cost about $100.

That’s right: $100. It’s that, or we keep going until there’s no helium left. And then... it’s Thunderdome. You know the rules—there are none.

Aug
16
2010

Another tidal generator: But this one is hiding underwater. This is why I didn't know what they look like.
Another tidal generator: But this one is hiding underwater. This is why I didn't know what they look like.Courtesy Fundy
Along with wind and solar, harvesting power from tidal forces comes up a lot in discussions of alternative energy sources.

Was that a horrible sentence? I think it was. What I meant to say is this: we can generate electricity from tides, and lots of it. "Tidal power" is often brought up alongside solar power and wind power, but while I can easily picture windmills and solar panels, I'm not always sure what sort of device we'd use to harness the power in the tides.

This sort of device! For those of you too afraid to click on a strange link (who knows... I could be linking to an image like this!), the article depicts something that looks sort of like a thick, stubby windmill, with blades on its front and back. It's a tidal turbine, and at 74 feet tall and 130 tons it's the world's largest. It should be able to supply electricity to about 1,000 households. Pretty impressive.

Tidal turbines, apparently, are so productive because water is so much denser than water, and so it takes a lot more energy to move it. An ocean current moving at 5 knots (that's a little shy of 6 miles per hour, for the landlubbers) has more kinetic energy, for example, than wind moving at over 217 miles per hour.

At least according to that article, the United States and Great Britain each have enough tidal resources (areas where this kind of generator could be installed) to supply about 15% of their energy needs.

More info on the tidal turbine, which I am calling "the Kraken," because it's big, underwater, and will occupy your mind for only a very short time.

Aug
03
2010

Aurora borealis above Lake Harriet in Minneapolis, MN: The white streak visible in the lower right of the timed exposure is an aircraft taking off from the Minneapolis-St. Paul airport.
Aurora borealis above Lake Harriet in Minneapolis, MN: The white streak visible in the lower right of the timed exposure is an aircraft taking off from the Minneapolis-St. Paul airport.Courtesy Mark Ryan
Old Sol could be stirring up the atmosphere this evening with a display of northern lights (aurora borealis). Scientists have recorded a significant burst of plasma shooting from the Sun’s surface that could mean we earthlings are in for a light show tonight or early Wednesday morning. The solar wind particles are headed right toward us, and when they reach the Earth’s magnetic field they’ll interact with atoms of nitrogen and oxygen in the atmosphere and - hopefully - produce glowing sheets and fingers of green, red, blue, or even yellow in a wonderful display in the northern skies. The southern hemisphere experiences the same phenomenon but down there it’s known as the aurora australis (southern lights).

Lately, here in the Twin Cities, the air has been supersaturated with humidity so I don’t know how crisp a view we’ll get but it could be worth stepping outside tonight to see what’s up.

SOURCE and LINKS
CNN.com report
Univ. of Alaska’s Geophysical Institute Aurora Forecast page
Michigan Tech’s Aurora page
Solar flares

Jul
25
2010

Slow boat to China: Cargo ships are cutting their sailing speeds to reduce costs.
Slow boat to China: Cargo ships are cutting their sailing speeds to reduce costs.Courtesy mikebaird

Save 40% on fuel costs by slowing down 20%

Slower speeds also reduce pollution. Too bad that is not why the shipping companies are slowing down. The tough economic times has forced many to think of ways to cut costs.

$100 million in fuel savings

It is believed that Maersk, the world's largest shipping line, with more than 600 ships has saved more than $100 million on fuel since it began its go-slow policy. Instead of the standard 25 knots to 20 knots, some container ships are slowing down to 12 knots (about 14 mph). This is slower than the speed of sailing clippers such as the Cutty Sark more than 130 years ago.

Works for cars and trucks, too

Driving too fast or rapid acceleration wastes money.

You can lower your gas mileage by 33 percent at highway speeds and by 5 percent around town.
You can assume that each 5 mph you drive over 60 mph is like paying an additional $0.24 per gallon for gas. fueleconomy.gov

There should be a law

Saving money and reducing pollution should be a no-brainer but people with too much money often choose to speed. I think slowing down should be mandatory.

Learn more about speed vs saving

Source Modern cargo ships slow to the speed of the sailing clippers The Guardian