Tag Archives: global warming

Global warming will increase drought in much of North America

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What is now considered an unusually extreme drought conditions in North America, could be a normal state in that part of the American continent in the middle of this century because of global warming.

A team of scientists from U.S. national laboratories, Lawrence Berkeley and Lawrence Livermore, and U.S. Administration’s National Oceanic and Atmospheric Administration (NOAA for its acronym in English), has reached this conclusion after analyzing 19 different climate models of last generation.

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Examining the balance between precipitation and evapotranspiration, the authors of the new research has found that global warming leads inexorably to drought, despite the many changes that may experience rainfall patterns over the next 100 years. Continue reading →

Does the number of people affected by global warming

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The death of up to 90 percent of the corals present in certain parts of the world, and the collapse of ecosystems based on them, is beginning to leave enough people there without the means of subsistence.

does the number of people affected by global warming

Coral reefs reduce beach erosion, support tourism and serve as breeding grounds and habitat for fish. Coral bleaching, a consequence of environmental conditions increasingly hostile creatures must endure, makes the iridescent white reefs in cemeteries such as bone, and is damaging to coral reefs worldwide. Blame it on several factors, but the most dangerous is global warming. Because corals are highly sensitive to temperature, even small amounts of warming can trigger bleaching.

When ocean temperature rises beyond the narrow temperature range that corals can withstand, expel single-celled algae that live within the coral tissue, give color to the corals, and, most importantly, provide much of its nutrition. A prolonged bleaching leads to coral death. Continue reading →

In certain regions, deforestation can cool rather than warm

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Many scientists believe that deforestation contributes greatly to global warming. But new research from Yale University shows that in fact in some northern latitudes contributes to a climate cooling locally.

If trees are cut down a lot in the boreal region, above 45 degrees north latitude, yields a net cooling effect. By cutting down the trees, just releasing carbon into the atmosphere, which contributes to the greenhouse effect, but then increases the albedo of the ground if it is light in color (or is covered with snow), and therefore more sunlight reflected into space, light can no longer heat the surface.

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Xuhui Lee, principal investigator of the study and professor of meteorology at Yale University, United States, and experts from 20 other institutions have found that the level of surface temperatures in the deforested areas analyzed are cooler than before deforestation due to snow cover, well lodged in the ground, reflecting sunlight and the place is not so hot, unlike what happens in nearby wooded areas, whose coverage of tree canopy absorbs more solar heat. At night, in the absence of the effect of reflection, deforested areas cool faster than the forests, which causes the warm air down in a turbulent from higher levels to the ground surface. Continue reading →