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By Nina Chestney LONDON (Reuters) - The complete melt of the Greenland ice sheet could occur at lower global temperatures than previously thought, a study in the journal Nature Climate Change showed on Sunday, increasing the threat and severity of a rise in sea level. Substantial melting of land ice could contribute to long-term sea level rise of several meters, potentially threatening the lives of millions of people.

Scientists at Universidad Carlos III de Madrid, Oxford University and the University of Michigan have joined efforts to develop new materials for thermonuclear fusion reactors.

(PhysOrg.com) -- Researchers at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory and the Universidad San Francisco de Quito in Ecuador have found that, at just the right temperatures, nanoclusters form and improve the flow of electrical current through certain oxide materials.

That the world's population is cramming into cities at a rapid pace has countless environmental benefits. A big one is that as people urbanize, we chop down fewer trees. The world’s forests double as the planet’s lungs.