Posted on February 11, 2016 by Bob Berwyn
Impacts of greenhouse gas emissions will last for thousands of years.
‘It is high time that this essential irreversibility is placed into the focus of policy-makers’
Today’s debates about global warming impacts are much too shortsighted, according to a new analysis, which warns that, at the current rate of greenhouse gas emissions, the Earth is likely to suffer irreparable damage that could last tens of thousands of years.
“Much of the carbon we are putting in the air from burning fossil fuels will stay there for thousands of years – and some of it will be there for more than 100,000 years,” said Oregon State University paleoclimatologist Peter Clark. “People need to understand that the effects of climate change on the planet won’t go away, at least not for thousands of generations,” said Clark, lead author of the article. Continue reading
Filed under: climate and weather, climate change, Environment, global warming | Tagged: climate change, Environment, global warming, life on Earth, long term climate change impacts, sea level rise | 1 Comment »
Posted on February 10, 2016 by Bob Berwyn
‘A normal year in the Southwest is now drier than it once was’
A federal climate assessment projects soaring temperatures for the Southwest.
A subtle long-term shift in atmospheric patterns driven by global warming could lead to longer and more intense droughts in the southwestern U.S. and other semi-arid regions. Most climate models suggest that that a belt of higher average pressure that now sits closer to the equator will move north. This high-pressure belt is created as air that rises over the equator moves poleward and then descends back toward the surface.
That shift may already be affecting the climate of the Southwest, as moisture-bearing weather patterns have become more rare in the region, according to a new study. Previous research has suggested that the region’s forests and fish and birds are in big trouble. In Australia, researchers are nearly certain that global warming was a factor in a record-breaking 2013 heatwave. A federal climate assessment released in 2013 also identified similar concerns for the Southwest.
“A normal year in the Southwest is now drier than it once was,” said Andreas Prein, a postdoctoral researcher at the National Center for Atmospheric Research who led the study. “If you have a drought nowadays, it will be more severe because our base state is drier.” Continue reading
Filed under: climate and weather, climate change, Drought, Environment, extreme weather, global warming | Tagged: climate change, drought, global warming, Southwest | Leave a comment »
Posted on February 9, 2016 by Bob Berwyn
Sudden cooling may have hastened decline of Eastern Roman empire
After a careful scrutiny of tree-ring records, scientists say they may have identified a link between a sudden shift in climate and geopolitical upheaval about 1,500 years ago.
The sudden drop in temperatures in the northern hemisphere followed a trio of large volcanic eruptions in the years 536, 540 and 547 AD, when sulphate aerosols emitted by the volcanoes may have cooled the atmosphere by blocking sunlight.
Within five years of the onset of what the scientists have dubbed the “Late Antique Little Ice Age,” he Justinian plague pandemic swept through the Mediterranean between 541 and 543 AD, striking Constantinople and killing millions of people in the following centuries. The authors suggest these events may have contributed to the decline of the eastern Roman Empire. Continue reading
Filed under: climate and weather, climate change, global warming | Tagged: climate change, history, Late Antique Little Ice Age, volcanic eruptions | 1 Comment »
Posted on February 8, 2016 by Bob Berwyn
Greenhouse gas emissions from aviation are a huge factor in the global climate change puzzle. @bberwyn photo.
Watchdogs say global carbon-trading system for airlines is needed to cap emissions
After years of foot-dragging, the aviation industry is close to adopting a CO2 emissions standard for aircraft, which will require aircraft builders to start producing more fuel efficient planes.
A group of technical experts with the International Civil Aviation Organization agreed on the proposed standard this week; the organization is expected to adopt the standard at an annual meeting this spring. The industry will also start to consider an overall cap on emissions at 2020 levels. The ICAO could take a vote on such a cap, as well as a carbon-trading program, later this year. Continue reading
Filed under: climate and weather, climate change, global warming | Tagged: airline CO2 emissions, airline emissions standard, aviation industry, civil aviation, climate change, global warming, greenhouse gases | Leave a comment »
Posted on February 8, 2016 by Bob Berwyn
Last year, mild winter conditions eased foraging conditions for ungulates, but this year’s cold temps and deep snow could result in increase mortality. @bberwyn photo.
‘Wildlife has been experiencing and surviving severe weather for eons without human intervention’
Harsh winter conditions in northwestern Colorado may take a toll on already struggling mule deer herds, state biologists said last week, explaining that they’ve started a limited feeding program to try and keep ungulates from invading cattle grazing areas.
The recent storms have created conditions ranking among the most extreme in the past 35 years. Temperatures dropping well below zero and deep powder snow atop brittle crusts are making it harder for deer and elk to forage and could lead to increased wildlife mortality in portions of the region unless the weather moderates significantly, according to Colorado Parks and Wildlife. Continue reading
Filed under: climate and weather, Colorado, Environment, Snow and weather, wildlife | Tagged: Colorado, Colorado parks and wildlife, elk, Mule deer, mule deer feeding, wildlife, winter mortality | 1 Comment »
Posted on February 7, 2016 by Bob Berwyn
Antarctic sea ice also below average
Arctic sea ice extent is declining at a rate of about 3.2 percent per decade. @bberwyn photo.
Arctic sea ice extent in January was the lowest in the satellite record, according to the latest monthly update from the National Snow and Ice Data Center. Scientists said the new record monthly low was likely the result of unusually high air temperatures over the Arctic Ocean and a strong negative phase of the Arctic Oscillation for the first three weeks of the month.
Meanwhile in the Antarctic, this year’s extent was lower than average for January, in contrast to the record high extents in January 2015.
In the Arctic, the ice extent average 5.2 million square miles, 402,000 square miles below the 1981 to 2010 average and 35,000 square miles below the previous record January low that occurred in 2011.
Across most of the Arctic Ocean, air temperatures ran more than 13 degrees above average for most of January as a cyclical air pressure shift enabled warm air to flow northward toward the Arctic.
Over the long term, January sea ice extent is shrinking at a rate of about 3.2 percent per decade. Sea ice extent has been below 14.25 million square miles every year since 2005, according to the NSIDC.
But some projections suggest that winter sea ice extent could hold steady or even increase in the short term because of changes in a key Atlantic Ocean current that transports cold water northward. Observational data show a slight upward trend in Arctic sea ice extent from 2005 to 2015.
See the full NSIDC update here.
Filed under: Arctic, climate and weather, Environment, global warming | Tagged: Arctic sea ice, climate change, Environment, global warming | 1 Comment »
Posted on February 7, 2016 by Bob Berwyn
Sprawling metropolis it may be, but LA has that certain something that defines world cities. It’s alive with art and food and ethnic diversity and hums with energy 24-7. In my opinion, most of the people who badmouth Southern California have probably never been there, so I say, don’t knock it till you’ve tried it. Besides, who can argue with a 70-degree day in the middle of winter?
Filed under: Morning photo, photography, Travel | Tagged: LA, Los Angeles, photography, SoCal, Travel | Leave a comment »