Stories tagged global warming

Jun
24
2009

Last January, Bryan praised Barack Obama’s inaugural address for promising to make decisions based on observation, data and statistics. Bryan also said,

We will keep a watchful eye over the next four years to make sure that science policy adheres to the agenda and principles that our new president has set out.

So, how are things going so far?

One:

Last week, the White House released a new report on climate change. Roger Pielke Jr., professor of environmental studies at the University of Colorado, says the study is seriously flawed. He finds the report relies on data that is old, narrow, non-peer reviewed, second- and third-hand, and contradicted by more recent, peer-reviewed studies. He specifically objects to claims that global warming is leading to more natural disasters. Such disasters are Dr. Pielke’s specialty, and he argues there is no such trend.

Two:

Back in February, Secretary of Energy Steven Chu said that global warming was going to destroy agriculture in California. Dr. Pielke (who is becoming something of a one-man band in reigning in the more outrageous claims of global warming) picked apart that one as well.

Three:

In March, Interior Secretary Ken Salazar removed gray wolves in the northern Rockies from the Endangered Species list. This action was first proposed by President George W. Bush just before he left office, but suspended by the incoming administration. Two months later, they decided that Bush was right to accept the unanimous recommendation of Fish and Wildlife scientists.

Mark hates it when I point out stuff like that…

Jun
12
2009

Wind energy harvest farm: Palm Springs, California
Wind energy harvest farm: Palm Springs, CaliforniaCourtesy Mark Ryan
Is the wind being knocked out of the sails of the wind energy industry? A study to be published this summer in Journal of Geophysical Research seems to be pointing that way. Wind measurements in the Midwest and eastern parts of the United States in particular have shown a decline in the energy source.

Two atmospheric researchers, Sara Pryor (no relation to Science Buzz’s own Liza Pryor – or is she?) of Indiana University, and her co-author Eugene Takle, a professor at Iowa State University say their research shows a distinct drop in wind speed in areas east of the Mississippi River, especially around the Great Lakes. Wind speeds there have diminished 10 percent or more in the past decade, and an overall decline in wind has been taking place since 1973.

Global warming may be the cause. Differences in barometric pressure drive wind production. In a global-warming environment, the Earth’s polar regions warm more quickly than the rest of the globe, and narrow the temperature difference between the poles and equatorial regions. That reduced difference in temperature also means a reduced difference in barometric pressure, which results in less air movement (wind).

Peak wind speeds in western regions of the US such as Texas and portions of the Northern Plains haven’t changed nearly as much. Pryor speculates the reason the Great Lakes area shows the greatest decrease may be because wind travels more slowly across water than ice, and in recent years there’s been less ice formation on the Great Lakes. Changes in the landscape such as trees and new construction near instrument stations may have also skewed the research. Still, wind speed studies done in Europe and Australia showed similar declines there, adding credence to the Pryor and Takle findings.

There are detractors to the study. Jeff Freedman, an atmospheric scientist with a renewable energy-consulting firm in Albany, N.Y., says his research has revealed no definite trend of reduced wind speed. And even though research hasn’t been published yet, some climate models studying the effects of global warming seem to agree with Freeman’s findings.

But if Pryor’s and Takle’s study proves to be true, it could mean big losses to the wind energy industry, since a 10 percent drop in peak winds would mean a 30 percent change in how wind energy is gathered.

Scientific American website story
Story on Yahoo.com

According to the Global Humanitarian Forum, the number of deaths “that result from the spread of disease, malnutrition and natural disaster caused by climate change” is roughly 300,000 people per year.

Read more about it here.

Apr
23
2009

An environmentalist's dream: The rat-filled cans are too small to see in this picture.
An environmentalist's dream: The rat-filled cans are too small to see in this picture.Courtesy steven.buss
Here at Science Buzz, we sometimes have what might seem like a Through the Looking Glass attitude towards Earth Day and environmentalism. I, for one, litter filthy old cans all over my yard, comfortable in the knowledge that these cans will provide wonderful little shelters for the population of rats in my neighborhood. Sort of counter-intuitive, huh? Well check this out: after I get rats living in those cans, I’m going to use highly toxic chemicals to poison the little suckers in their homes. I will then plant sunflower seeds in my dead rat filled cans. So litter + poison + patience = a beautiful garden + delicious sunflower seeds.

Sophisticated environmentalism can be complicated like that.

It feels good though, doesn’t it? A little weird, but good.

Here’s another one (and this one comes from scientists who published in the journal Nature, not just from, you know, me):
Air pollution is fighting global warming!

Say what? We thought global warming was caused by air pollution.

Yes, but… think back to flowers growing from cans of dead rats. It’s like that, kind of.

See, yes, air pollution in the form of carbon dioxide (and other gases, but we’re dealing with CO2 here) is warming the planet. But CO2 isn’t the only junk we’re burping up into the atmosphere. Think about the grey brown haze you see over some big cities. Co2 is invisible, so what’s that stuff? Some of the chemicals we put into the atmosphere have the effect of absorbing sunlight, or reflecting it back into space. Some particles form the nucleus of water droplets in clouds, and cause the same amount of water in a cloud to be spread out among a much larger number of droplets, and more droplets cause light to be reflected and scattered more. It’s all part a phenomenon sometimes referred to as “global dimming”.

Some scientists believe that “global dimming” has had the effect of partially masking global warming; we aren’t as warm as we might otherwise be for the amount of greenhouse gasses in the atmosphere because a significant amount of solar energy has been prevented from reaching the Earth by other pollutants. So there’s that.

The Nature article, however, focuses on something else entirely. While many people might assume that plants have a harder time growing in our pollution-dimmed world, it turns out that they actually seem to grow better under a hazy blanket of pollution. The light-scattering effect of many air pollutants actually causes light to reach more plant leaves. So more photosynthesis is taking place under this diffused light than under direct sunlight. That means that plants are growing more, and growing plants suck up more carbon dioxide.

The scientists behind the study estimate that global dimming could be responsible for as much as a one quarter increase in plant productivity from 1960 to 1999, causing a 10% increase in the amount of carbon stored by the land.

This also means that as we have stricter air pollution controls, the rate of global warming probably won’t decrease as much as we’d have thought—there’d be less CO2 in the air, but because other pollutants would be reduced as well plants would be less productive, and suck up less of the CO2 that is released.

Well, shucks.

If your answer is "Nothing, yet," then you might consider stopping by the museum.

Minnesota's Water Resources: Impacts of Climate Change
Dr. Lucinda Johnson, National Resources Research Institute, University of Minnesota-Duluth
Thursday, April 9, 2009
7 - 8:30 pm in the Auditorium

Over the past 150 years, Minnesota's climate has become increasingly warmer, wetter, and variable, resulting in undeniable ecological impacts. For example, more recent changes in precipitation patterns combined with urban expansion and wetland losses have resulted in an increase in the frequency and intensity of flooding in parts of Minnesota. Learn about exciting new research which will develop a prediction model for future climate changes specific to Minnesota, and discover its potential economic and civic impact.

Check it out.

Want to do your little part to raise awareness of Earth's energy crisis? Turn out all your lights Saturday from 8:30 to 9:30 p.m. A rolling global blackout will be taking place to mark Earth Hour 2009, the third year such an observance is being made. Among the celebrity endorses of the power-free hour is the band Coldplay, which I assume will be playing an acoustic set if it's on stage during those hours. More than one billion people are expected to cut their lights for an hour around the world Saturday.

Two recent headlines:

Increased Number Think Global Warming Is “Exaggerated”

Leading climate scientist: 'democratic process isn't working'

Because, y’know, if you can’t win an argument through reason, and you can’t win it through fear, you can always fall back on that old standby, force.

Researchers at Florida State University have found that hurricane activity, both in the North Atlantic and globally, is at a 30-year low, and the trend is expected to continue.

Many people viewed the disastrous 2005 hurricane season as evidence of global warming. Others have pointed to the calmer-than-normal years since then as evidence that global warming is just hype.

Both sides are wrong. Climate is about long-term trends. A single season -- or even a string of seasons -- is not enough to establish a pattern, especially with something as complex as weather. As the Florida report notes, further study is needed before we'll really know what's going on.

Krill: a link in the food chain.
Krill: a link in the food chain.Courtesy Wikipedia (Photo by Øystein Paulsen)
The above title is a bit clumsy but it conveys what some scientists claim is going on around the south polar region due to climate change and warming temperatures. Changes in wind patterns across Antarctica are not only affecting the composition and levels of phytoplankton in areas there but rising temperatures are also causing sharp changes in the Chinstrap and Adelie penguin populations that feed on the krill that feed on the phytoplankton. The ecosystem appears to be going out of whack. Read more...

LA Times article
Science
Insciences.org article