global warming

Aliens may kill earthlings for global warming -- scientists

With human efforts failing to make a serious dent in the problem of global warming, it seems aliens might soon take up the challenge.

Equator bulge: melting polar ice making Earth obese

After 20,000 years of slimming down, Earth is putting on weight again, all thanks to global warming and its repercussions.

Warming oceans could melt polar ice sheets faster than expected

The Greenland and Antarctic ice sheets are losing mass at much accelerating pace than realized, thanks to the warming oceans beneath the glaciers.

Polar bears seen with 'piggy back' cubs

London -- Polar bears are carrying cubs on their backs while they swim through icy waters, possibly because of global warming melting arctic ice, U.K. researchers say.

Scientists say they believed it to be a new behavior, possibly the result of bears having to swim longer distances in the ocean because of reduction in the amount of ice used by the bears as seal-hunting territory, Britain's Daily Telegraph reported.

During the longer swims, traveling on the mother's back could be vital for the survival of the cubs, scientists say, as being on the mother's back means the cub's body is in direct contact with the adult's fur and a large part of the baby is out of the icy water, thereby reducing heat loss.

Greenhouse CO2 emissions on the rise again

Exeter, England -- Carbon dioxide emissions, the main greenhouse gas contributing to global warming, continue to rise and may reach record levels this year, U.K. researchers say.

A study led by the University of Exeter is part of the annual carbon budget update by the Global Carbon Project, ScienceDaily.com reported Monday.

The study found that despite the global financial crises affecting Western economies that led to a 1.2 percent reduction of CO2 emissions from record 2008 levels, that reduction was less than half what was predicted a year ago.

Meanwhile, emerging economies like China and India experienced strong economic performance despite the financial crisis and recorded substantial increases in CO2 emissions.

Scientists study ancient global warming

Balboa, Panama -- An abrupt global warming episode 56 million years ago led to an explosion of plant diversity in northern South America, Panamanian researchers say.

A 9-degree Fahrenheit spike in temperatures during 10,000 years -- a blink of an eye on a geological scale -- had researchers expecting to find evidence of a mass die-off of many tropical plant species, ScienceNews.org reported.

"We were expecting to find rapid extinction, a total change in the forest," says study leader Carlos Jaramillo, a biologist at the Smithsonian Tropical Research Institute in Balboa, Panama. "What we found was just the opposite -- a very fast addition of many new species, and a huge spike in the diversity of tropical plants."

Climate change could reverse Atlantic flow

Barcelona -- Global warming could reverse the flow of deep waters in the Atlantic Ocean, just as climate change did 20,000 years ago, Spanish researchers say.

Universitat Autonoma de Barcelona scientists say such a reversal is expected in the course of climate warming over the next 100 years, ScienceDaily.com reported Thursday.

Atlantic Ocean circulation is an important part of the climate system as warm currents like the Gulf Stream transport energy from the tropics to the subpolar North Atlantic and influence regional weather and climate patterns, the researchers say.

Majority of Americans unaware of climate change issues--study

In a study released by Yale University titled 'Americans Knowledge of Climate Change,' majority of Americans are unaware of how grave climate change and global warming issues are.

Global warming affects tropical life more

Seattle -- Global warming is greatest in the Northern Hemisphere but its impact on life could be much greater in the tropics, a U.S. study says.

Even with smaller increases in temperature in the world's tropical zones, those regions could see greater impacts on life, ranging from shifting geographic ranges to species extinction, says Michael Dillon, an assistant professor of zoology and physiology at the University of Wyoming.

A study focused on ectothermic, or cold-blooded, organisms, those whose body temperature approximates the temperature of their surroundings.

Calif. voters split on greenhouse gas law

Los Angeles -- Most Californians say global warming is a serious issue but are split on an upcoming ballot measure about the state's pioneering climate law, a poll indicates.

California's sweeping global warming law requires greenhouse gas emissions by power plants, factories and vehicles be slashed to 1990 levels by the end of the decade, but Proposition 23 on the November ballot would suspend the 2006 law until the state's unemployment rate drops to 5.5 percent for an entire year, USA Today reported.

The state's unemployment is currently more than 12 percent, and California rarely has a yearlong level below 5.5 percent, the Los Angeles Times reported.

Global warming may end 'polar' storms

Reading, England -- Climate change, expected to increase extreme weather events around the world, will make one particular kind of event rarer, U.K. researchers say.

Scientists at the University of Reading say climate simulations show severe North Atlantic storms known as "polar lows" and resembling arctic hurricanes may decrease by as much as 50 percent by the end of this century, a report in the journal Nature says.

Polar lows are small-scale but severe winter storms that threaten offshore human activities in the North Atlantic region.

Reading researchers Matthias Zahn and Hans von Storch studied the formation of polar lows in a series of regional climate simulations corresponding to different possible future climates.

Women more likely to believe in climate change than men--study

Challenging the age old belief that men understand science better, a new study has revealed that women not only have a good understanding of science but are also more likely than men to believe in climate change science.