By Stephen Leahy
UXBRIDGE, Canada, May 22, 2012 (Tierramérica)
Mexico and Central America look like they are covered in dried blood on maps projecting future soil moisture conditions.
The results from 19 different state-of-the-art climate models project extreme and persistent drought conditions (colored dark red-brown on the maps) for almost all of Mexico, the midwestern United States and most of Central America.
If climate change pushes the global average temperature to 2.5 degrees Celsius above pre-industrial era levels, as many experts now expect, these regions will be under severe and permanent drought conditions.
Future conditions are projected to be worse than Mexico’s current drought or the U.S. Dust Bowl era of the 1930s that forced hundreds of thousands of people to migrate.
These are some of the conclusions of the study “Projections of Future Drought in the Continental United States and Mexico”, which was published in the December 2011 issue of the American Meteorological Society’s Journal of Hydrometeorology and has gone largely unnoticed.
“Drought conditions will prevail no matter what precipitation rates are in the future,” said co-author Michael Wehner, a climate scientist at the Lawrence Berkeley National Laboratory, a U.S. government research centre in California.
“Even in regions where rainfall increases, the soils will get drier. This is a very robust finding,” Wehner told Tierramérica.
Without major reductions in carbon emissions from the burning of fossil fuels, global temperatures will increase to at least 2.5 degrees of warming between 2050 and 2090, depending on rates of emissions of greenhouse gases, climate sensitivity and feedbacks. Continue reading