The physics of Earth’s natural systems show that a delay—of even a decade—in reducing CO2 emissions will lock in large-scale, irreversible changes. If carbon dioxide emissions do not begin to trend down this decade, it will be nearly impossible to stabilize the climate at any acceptable level.

On Aug. 8, 1975, geoscientist Wallace Smith Broecker published "Are We on the Brink of a Pronounced Global Warming?" in the journal Science, the first time the iconic phrase "global warming" was used in a scientific paper.

(Reuters) - Nearly 3 billion people, or two-fifths of the world's population, were at risk of contracting malaria in 2009 and closer study of the mosquito's life cycle is needed to combat the disease, researchers said in two reports.

In the first study, scientists mapped out the geographical spread of the Plasmodium vivax -- the most common parasite that causes malaria -- using reported cases of malaria and details on temperature and aridity.