Scientists Urge Speedy Emission Cuts

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Stepping up the pressure for political action on global warming, scientists for the second time in two months have called for strong measures to curb greenhouse-gas emissions.

The American Geophysical Union (AGU) - the world's largest scientific organization dedicated to Earth, atmospheric, and space sciences - warned Thursday that the world will need to reduce emissions by 50 percent below 1990 levels within this century if countries are serious about holding down warming to around 3.6 degrees F. by 2100.

Significantly warmer temperatures over that period would lead to seriously disruptive changes for societies as well as for ecosystems around the planet, many …