New study suggests natural aerosols may be a bigger factor than previously thought
By Summit Voice
FRISCO — In their quest to better understand the role of aerosols in the Earth’s climate, researchers may have to try and find the cleanest parts of the atmosphere.
Knowing to what degree both human-caused and natural aerosols mask the effects of heat-trapping greenhouse gases is crucial to making accurate climate predictions, according to a new study that assessed 28 factors that could affect the uncertainties in cloud brightness.
FRISCO — The U.S. Supreme Court won’t question the EPA‘s fundamental finding that greenhouse gases are a big environmental threat, but the justices will decide how far the agency’s authority to regulate those gases extends.
At issue is the EPA’s ability to set emission limits on cars, factories and power plants — all key pieces in the Obama administration’s push to get a handle on global warming. Big business, of course, would like to see business-as-usual, and along with several states, legally challenged the EPA’s rule-making authority. Continue reading “Climate: U.S. Supreme Court eyes greenhouse gas ruling”→
All around the globe, the land areas show a greater increase in temperature than the surrounding ocean waters. Evaporation of the water helps to keep the ocean surface cool and the deep depths of the ocean have a large capacity to absorb energy before heating up.
It not easy reading, and it’s not easy to swallow the conclusions, but the report makes it clear that this is not the time for denial. The most pronounced warming will be in the northerh hemisphere, and areas like the Rocky Mountains and northern Canada could feel the heat sooner rather than later.
Without drastic cuts in greenhouse gas emissions, the average temperature across the contiguous 48 states is projected to increase by a life-changing 9 degrees Fahrenheit by 2100. Globally, temperatures are expected to climb by 7 degrees.
That warmth will cause sea level to rise by anywhere from 10 to 35 inches by 2100 — and that’s a conservative estimate. Some other studies estimate a 40-inch rise in sea level by 2100.
One crucial area that isn’t comprehensively covered by the IPCC involves the carbon locked into the world’s icy permafrost region. The report estimates huge thawing in permafrost region, but downplays the additional warming effects resulting from the release of that carbon, which could amount to another couple of degrees of temperature increases by 2100.
Future looks grim without drastic greenhouse gas cuts
By Bob Berwyn
FRISCO — The news is out and it’s not good. In fact, the latest update of the Intergovernmental Panel on Climate Change is full of dire warning signs that the continued buildup of heat-trapping greenhouse gases, if left unchecked, will lead to a climate catastrophe with dire consequences for humanity and the rest of the planet’s species.
FRISCO — The number of severe heatwaves could double by 2020 and quadruple by 2040, according to a team of German and Spanish scientists who fine-tuned a set of climate models to try and reduce uncertainty. In the second half of the century, even higher frequencies are expected unless greenhouse gas emissions are reduced.
‘Gravel parking lots instead of coral reef gardens’
By Summit Voice
FRISCO — Global warming is likely to drastically reduce ocean diversity, without a food web that’s able to support an abundance of large sharks and whales. A new study shows that oceans in an ancient greenhouse world had few large reefs,poorly oxygenated water and tropical surface waters warm as a hot tub.
Mountains around L.A. could see drastic reduction in winter conditions
By Summit Voice
FRISCO — Skiing in the mountains of Southern California is already a dicey proposition, and by mid-century, L.A. skiers might have to look elsewhere for turns.
A UCLA study released this week shows that snowfall will drop by 30 to 40 percent in the next few decades. Of course, the impacts go far beyond recreation. Changes in seasonal precipitation will have a big impact on water supplies in the region, the researchers said.
The projected snow loss, a result of climate change, could get even worse by the end of the 21st century, said UCLA climate expert Alex Hall.