Nearly half of all Americans – more than 147 million – live in counties in the U.S. where ozone or particle pollutions levels make the air unhealthy to breathe, according to the American Lung Association's "State of the Air 2014" report released today. The 15th annual national report card shows that while the nation overall continued to reduce particle pollution, a pollutant recently found to cause lung cancer, poor air quality remains a significant public health concern and a changing climate threatens to make it harder to protect human health.
>> Read the Full Article
The Antarctic ice sheet has lost ice twice as quickly in the past three years as when it was last surveyed between 2005 and 2010, say scientists.
Results from the CryoSat-2 satellite mission, published today in the journal Geophysical Research Letters, say the largest ice sheet on Earth is now losing 159 billion tonnes of ice each year.
>> Read the Full Article
Greenland is now mostly white. Snow and ice and glaciers abound, but are shrinking as the climate warms. Turns out that some of the glaciers are found in canyons and the canyons are deeper than previously thought.
Scientists at NASA and the University of California, Irvine (UCI), have found that canyons under Greenland's ocean-feeding glaciers are deeper and longer than previously thought, increasing the amount of Greenland's estimated contribution to future sea level rise.
"The glaciers of Greenland are likely to retreat faster and farther inland than anticipated, and for much longer, according to this very different topography we have discovered," said Mathieu Morlighem, a UCI associate project scientist who is lead author of the new research paper. The results were published Sunday in the journal Nature Geoscience.
>> Read the Full Article
Greenland's icy reaches are far more vulnerable to warm ocean waters from climate change than had been thought, according to new research by UC Irvine and NASA glaciologists. The work, published today in Nature Geoscience, shows previously uncharted deep valleys stretching for dozens of miles under the Greenland Ice Sheet. The bedrock canyons sit well below sea level, meaning that as subtropical Atlantic waters hit the fronts of hundreds of glaciers, those edges will erode much further than had been assumed and release far greater amounts of water.
>> Read the Full Article
We are very concerned with the changing climate on Earth. The climate on other planets is more difficult to study, and direct observations are impossible, save some observations from the Mars rovers. Jupiter has an atmosphere that is very different from Earth's. The prominent Giant Red Spot, a swirling anti-cyclonic storm larger than Earth, appears to be a permanent fixture of the planet's atmosphere, and has been remarkably stable for decades.
Now the Great Red Spot has shrunk to its smallest size ever measured.
According to Amy Simon of NASA's Goddard Space Flight Center in Greenbelt, Maryland, recent NASA Hubble Space Telescope observations confirm the Great Red Spot now is approximately 10,250 miles across, less than half the size of some historical measurements. Astronomers have followed this downsizing since the 1930s.
>> Read the Full Article
Rising greenhouse gas levels are causing stronger winds over the Southern Ocean. It's good news for Antarctica, writes Tim Radford, as the circumpolar winds are keeping its ice caps cold. But Australia is getting hotter and drier - and its problems will only increase.
The answer to one of the enduring puzzles of global warming - the apparently sluggish response of the Antarctic continent to rising greenhouse gas levels - may have been settled by Australian scientists.
>> Read the Full Article
