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New research from Carnegie's Global Ecology department concludes that evaporated water helps cool the earth as a whole, not just the local area of evaporation, demonstrating that evaporation of water from trees and lakes could have a cooling effect on the entire atmosphere

Globally, this cycle of evaporation and condensation moves energy around, but cannot create or destroy energy. So, evaporation cannot directly affect the global balance of energy on our planet.

It is well known that the paving over of urban areas and the clearing of forests can contribute to local warming by decreasing local evaporative cooling, but it was not understood whether this decreased evaporation would also contribute to global warming

More than 12,000 opponents of the proposed Keystone XL oil pipeline encircled the White House in Washington, D.C. on Nov. 6, weeks before President Obama's expected decision on what's become an iconic environmental battle.

Running to the Gulf of Mexico from Alberta's oil fields, the pipeline would cut through the Great Plains and threaten oil spills into the Oglalla aquifer, the single largest source of fresh water in the United States.

Though federal permits haven't yet been granted, landowners on the pipeline's path have been threatened with eminent domain land seizures; the federal review process has been corrupt, steered by oil company executives with insider connections and industry-hired consultants.