Posted on July 23, 2014 by Bob Berwyn
Growth in sea ice may be slower than reported
Scientists are puzzling over the expansion of Antarctic sea ice. bberwyn photo.
FRISCO — Global warming deniers have long been using the observed expansion of Antarctic sea ice as a way to try and confuse the public about the reality of global warming, but some new research by scientists with the Scripps Institution of Oceanography at University of California San Diego suggests the rate of expansion is not as dramatic as reported.
The findings, published in The Cryosphere (European Geosciences Union) acknowledge that there has been some expansion recently, but that some of the reported ice gain may be due to inconsistencies in computer models used to measure Antarctic sea ice. Continue reading
Filed under: Antarctica, climate and weather, global warming | Tagged: antarctic sea ice, climate, global warming, IPCC | Leave a comment »
Posted on April 14, 2014 by Bob Berwyn
Curbing global warming will require big cuts in greenhouse gases
March 2014 temperatures were above average across most of the globe.
By Summit Voice
FRISCO —Greenhouse gas emissions continue to climb despite international attempts to curb heat-trapping gases, the Intergovernmental Panel on Climate Change said in its latest climate report.
Issued Sunday in Berlin, the report shows that greenhouse gas emissions grew more quickly between 2000 and 2010 than in each of the three previous decades. Only with significant institutional, social and technological changes will humankind be able to meet its stated target of limiting warming to two degrees Celsius, the scientists wrote. Continue reading
Filed under: climate and weather, global warming | Tagged: climate change, Environment, global warming, greenhouse gases, IPCC | 2 Comments »
Posted on April 7, 2014 by Bob Berwyn
Can we slow our greenhouse gas emissions? A global carbon tax could help.
Ending subsidies for fossil fuel companies also high on the list
FRISCO — A modest carbon tax of just $0.15 per kilo could lead the world down the path of meaningful action on global warming, says a Swedish researcher who was one of the coordinating lead authors of a new report that the Intergovernmental Panel on Climate Change will present next week.
“What we need to avoid dangerous climate change is the application of strong policy instruments,” said Thomas Sterner, professor of environmental economics at the University of Gothenburg. Continue reading
Filed under: climate and weather, energy, Environment, global warming | Tagged: carbon tax, climate change, Environment, global warming, IPCC | Leave a comment »
Posted on December 15, 2013 by Bob Berwyn
How warm will your town be at the end of the century?
November 2013 was the warmest on record for Planet Earth.
FRISCO — The jury may still be out on exactly how hot the Earth will be by the end of the century, but as climate models improve, scientists are narrowing the range.
In a recent effort to show changes on a regional scale, researchers with the U.S. Geological Survey and Oregon State University created a set of maps and summaries of historical and projected temperature and precipitation changes for the 21st century, down to a county level. Find your local global warming forecast here.
The maps and summaries are based on NASA downscaling of the 33 climate models used in the fifth annual Climate Model Intercomparison Project and the current Intergovernmental Panel on Climate Change Assessment Report. The resulting NASA dataset is on an 800-meter grid with national coverage. Continue reading
Filed under: climate and weather, Colorado, Environment, global warming | Tagged: climate, global warming, IPCC, local climate impacts | 1 Comment »
Posted on November 23, 2013 by Bob Berwyn
Many experts think seas could rise 2 meters by 2100
Sea level rise is already inundating parts of the Mississippi Delta. bberwyn photo.
By Summit Voice
FRISCO — Keeping sea level rise below 1 meter will require significant reductions in greenhouse gas emissions, a team of German and American researchers said this week after compiling the best available and most recent science.
Even with big cuts, sea level is expected to rise 40-60 centimeters by 2100 and 60-100 centimeters by 2300, according to the survey.
“While the results for the scenario with climate mitigation suggest a good chance of limiting future sea-level rise to one meter, the high emissions scenario would threaten the survival of some coastal cities and low-lying islands,” said Stefan Rahmstorf from the Potsdam Institute for Climate Impact Research. Continue reading
Filed under: climate and weather, Environment, global warming | Tagged: Environment, global warming, IPCC, sea level rise | Leave a comment »
Posted on October 22, 2013 by Bob Berwyn
New study says IPCC projections are too conservative
By Summit Voice
FRISCO — In a classic case of climate disruption, research shows that the dry season in southern Amazonia has lengthened by about one week per decade since 1979. Parts of the region may not be able to support rainforest vegetation much longer. A big forest die-back could trigger the release of large volumes of the greenhouse gas carbon dioxide into the atmosphere, a team of scientists warned this week.
The changes could disrupt plant and animal communities in one of the regions of highest biodiversity in the world, said University of Texas professor Rong Fu, who led the team of scientists. Continue reading
Filed under: climate and weather, Drought, Environment, global warming, greenhouse gases | Tagged: Amazon Rainforest, Climate disruption, global warming, Intergovernmental Panel on Climate Change, IPCC | Leave a comment »
Posted on December 27, 2012 by Bob Berwyn
Capping temperature increase at 2 degrees is almost unattainable
Global temperatures were well above average in Nov. 2012. Map courtesy NASA.
By Summit Voice
FRISCO —With 2012 winding down, climate scientists are taking stock of progress on controlling heat-trapping greenhouse gases, and the general conclusion is that it’s just about too late to stop the plunge off the climate cliff.
Researchers with the Global Carbon Project said in a report earlier this month that reductions required to limit global warming to the targeted 2 degrees Celsius are becoming a receding goal.
“A shift to a 2-degree Celsius pathway requires an immediate, large, and sustained global mitigation effort” said Global Carbon Project director Dr. Pep Canadell. Continue reading
Filed under: climate and weather, Environment, global warming, greenhouse gases | Tagged: climate change, Environment, Global Carbon Project, global warming, greenhouse gases, IPCC | Leave a comment »
Posted on December 18, 2012 by Bob Berwyn
University of Tennessee researchers say the eastern U.S. can expect more heatwaves and increased precipitation in a warming world. Image courtesy NASA.
New climate model pinpoints predictions down to the city level
By Summit Voice
SUMMIT COUNTY — As climate models become more sophisticated, researchers have started to fine-tune global warming impacts to the regional level, including more drought and water shortages expected in the Southwest, seasonal ice-free conditions in the Arctic, and hotter, wetter conditions in the Eastern U.S., according to a new University of Tennessee study.
The researchers, Joshua Fu, a civil and environmental engineering professor, and Yang Gao, a graduate research assistant, say heat waves will become more severe in most regions of the eastern United States and, that both the Northeast and Southeast will see a drastic increase in precipitation. Continue reading
Filed under: climate and weather, Environment, global warming | Tagged: climate change, East Coast, extreme weather, global warming impacts, IPCC, National Center for Atmospheric Research | Leave a comment »
Posted on November 30, 2012 by Bob Berwyn
Doubling of CO2 likely to result in 2.2 to 4.8 degrees Celsius warming
New research helps pinpoint the amount of heating caused by greenhouse gases.
By Summit Voice
SUMMIT COUNTY — Climate scientists know that greenhouse gases like carbon dioxide and methane trap heat in the atmosphere, but there’s still some uncertainty about how the overall system responds to varying levels of those gases.
By studying the paleoclimatic record, researchers have been able to measure relationships between past greenhouse gas increases and temperatures to some degree, and new research is helping them evaluate past climate sensitivity data to help improve comparison with estimates of long-term climate projections developed by the Intergovernmental Panel on Climate Change.
The scientists found that the likely range of climate sensitivity consistently has been of the order of 2.2 to 4.8 degrees Celsius per doubling of CO2, which closely agrees with the IPCC estimates. Continue reading
Filed under: climate and weather, Environment, global warming, greenhouse gases | Tagged: climate, Climate sensitivity, global warming, greenhouse gases, Intergovernmental Panel on Climate Change, IPCC, Radiative forcing | 2 Comments »
Posted on November 28, 2012 by Bob Berwyn
Observational data is piling up and showing that sea level rise is exceeding the rate predicted by the IPCC
Glaciers and ice caps are melting, and sea level is rising even faster than forecast by the IPCC. Photos courtesy NASA. (Click the image for more information.)
By Summit Voice
SUMMIT COUNTY — Sea levels during the past two decades are rising 60 percent faster than the general estimates made by the IPCC, according to new research published this week in the journal Environmental Research Letters.
The scientists with the Potsdam Institute for Climate Impact Research, Tempo Analytics and Laboratoire d’Etudes en Géophysique et Océanographie Spatiales said that, while temperature rises appear to be consistent with the projections made in the IPCC’s fourth assessment report , satellite measurements show that sea-levels are rising at a rate of 3.2 mm a year compared to the best estimate of 2 mm a year in the report.
“This study shows once again that the IPCC is far from alarmist, but in fact has under-estimated the problem of climate change,” said lead author Stefan Rahmstorf. “That applies not just for sea-level rise, but also to extreme events and the Arctic sea-ice loss.” Continue reading
Filed under: climate and weather, Environment, global warming | Tagged: climate, climate change, Current sea level rise, Environmental Research Letters, Intergovernmental Panel on Climate Change, IPCC, Potsdam Institute for Climate Impact Research, sea level rise | 6 Comments »