Stories tagged carbon emissions

Researchers at the University of Adelaide have developed a new nanomaterial that could help reduce CO2 emissions produced by coal-fired power plants. This new material acts like a sponge and “soaks up” the carbon dioxide before it is released into the atmosphere by trapping the CO2 molecules in tiny nano-sized pores. This new material is potentially much more energy efficient than other, current methods of separating out CO2 from power plant emissions.


Ka-chunk!: There goes the muffler...
Ka-chunk!: There goes the muffler...Courtesy Miguel Tremblay

We've all been there. You're driving along, bobbing your head along to the music, when suddenly you hit a pothole and it feels like your suspension is coming apart. It's especially bad here in Minnesota, because our extreme winters take their toll on worn asphalt. What's a gal to do?

One possible solution is a better way to fix potholes. In Duluth, MN, MNDOT workers are experimenting with new ways to hot patch asphalt with recycled materials and microwaves. In wintertime, crews usually have to patch potholes temporarily until summer comes along and they can use hot asphalt to make a more permanent patch. By using a special microwave, they can make hot patches even in bitter cold temperatures, and the recycled materials make for less waste and pollution. The new fix is also faster and cheaper than current methods.

My friend Wendie pointed out some billboards that went up recently in the metro area to promote concrete as a pothole-free alternative. (Wendie also passed along a handful of the articles in this post--thanks, Wendie!)

On the Think Concrete website, there's loads of info about how concrete lasts longer and saves money. But the question on my mind is, "Which is better for the environment?"
Asphalt: This heavyweight champ covers roads throughout the US, but can its popularity make up for inherent vice?
Asphalt: This heavyweight champ covers roads throughout the US, but can its popularity make up for inherent vice?Courtesy Seighean

A life cycle assessment comparing the environmental impacts of asphalt and steel-reinforced concrete was completed in 1998. It showed that while producing asphalt required more energy input, concrete required more ore and fertilizer inputs, and gave off more toxic emissions. On the other hand, asphalt was associated with higher levels of hazardous waste generation and management needs. The authors concluded that over the life of each material, the environmental impacts were roughly equal, but they also mentioned that asphalt was recycled more often than concrete, potentially turning the sustainability tide in its favor.

However, two separate studies have shown that concrete provides a better driving surface, decreasing the fuel needed to move a car down the road and thereby its emissions. (Both of the studies were completed in cooperation with cement associations, so throw some grains of salt in there). But there are other examples of concrete's environmental benefits.
Concrete: It's a tough contender, with lots of possibilities, but can it beat the title-holder for most ubiquitous road surface?
Concrete: It's a tough contender, with lots of possibilities, but can it beat the title-holder for most ubiquitous road surface?Courtesy Haljackey

And that's not all--there are some great innovations afoot with concrete. Some researchers are working to make cement with carbon absorbing properties, while others have found ways to make flexible concrete that heals itself, reducing the need for new materials and increasing safety.

Of course, there's also the pie-in-the-sky option: solar highways.


What what?
What what?Courtesy Public Domain
For those of you who want to choose the most environmentally friendly shaving solution, Slate's Green Lantern just did a column about the carbon footprints of different shaving options. Disposable or electric? Which is "greener"?

As with everything else in the future (where we live), even this little question is complicated. But the author seems to do a pretty good job unpacking it—you have to consider energy used in the process, whether for hot water or to run a small electric motor, as well as manufacturing costs and each product's useful lifetime.

The long and the short of it, depending on your shaving habits, is that electric razors are ultimately more energy efficient than plastic disposables. But just barely. According to the Green Lantern's calculations, you save about 15 pounds of carbon dioxide by using an electric shaver. And, as the author puts it, you would have to shave with a disposable razor for more than 350 years to equal the amount of greenhouse gases produced by one cow in a single year. (I don't think a cow produces 5200 pounds of greenhouse gas a year by itself. That figure might be taking in to consideration the gases produced by growing feed and processing the animal as well, or it might account for the greater potency of methane—which cows produce—as a greenhouse gas over carbon dioxide.)

In any case, this assumes that you shave your face at all. You might wear a beard, or you might be what I like to call "a female." Or you might take advantage of one of the many other shaving options: some men use old-fashion safety razors and straight razors; Crocodile Dundee finishes his shaves with a bowie knife; I cover my face in high-proof grain alcohol and set it ablaze (it's invigorating, but I can't maintain eyelashes well this way); I have friends who let cats lick away their stubble.

So this isn't the be-all-end-all. But it's like David Schwimmer says.