A new Australian scientific study projects that the world will likely warm between 4 and 10 degrees Fahrenheit from pre-industrial levels by 2100 if greenhouse gases are not curbed, reports Jeremy Hance at Mongabay. Already the Earth has warmed about 1.5 degrees Fahrenheit over the past century. This warming has led to shrinking glaciers, vanishing Arctic sea ice, increased risk of floods and drought, more extreme storms, and rising sea levels. Published in Nature Climate Change, the study finds that exceeding the 4-degree Fahrenheit threshold is very likely under business-as-usual emissions scenarios, a level that scientists have long warned would lead to catastrophic climate change. The wide 6-degree temperature range is due to three factors: climate sensitivity to greenhouse gas emissions, the unpredictability of the carbon cycle, and aerosols, which cool the planet. These three factors “remain highly uncertain,” but historical data imply that the projections become more certain when the factors are combined, rather than taken individually. “This study ultimately shows why waiting for certainty will fail as a strategy,” lead author Roger Bodman said, since some uncertainty will always remain, so we need to manage risks with the knowledge we have.
Join the swelling numbers of voters TELLING Congress they’ll vote for Clean Energy candidates here: http://signon.org/sign/we-are-the-clean-99?source=c.em.cp&r_by=487176 . This is an ongoing campaign (the next Congressional election is in 2 years!) so please, spread the word. It’s our way of telling Congress that a strong clean energy voting bloc is out there. This is how YOU can make a difference.
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Earth likely to warm between 2 and 6 degrees Celsius this century
(05/30/2013) A new study by Australian scientists projects that the world will likely warm between 2 and 6 degrees Celsius (3.6 to 10.8 degrees Fahrenheit) from pre-industrial levels by 2100. The study published in Nature Climate Change finds that exceeding the 2-degree threshold is very likely under business-as-usual emissions scenarios even as scientists have long warned that passing the 2-degree mark would lead to catastrophic climate change. http://news.mongabay.com/2013/0530-hance-temperature-range.html