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Science tells us how we are searing the planet. Economics tells us how much it will cost to do something — or nothing — about it. Neither science nor economics tells us right from wrong. That is the domain of ethics — and the Rock Ethics Institute's ClimateEthics website. ClimateEthics is both sober and sobering, a mature, dispassionate look at how global warming changes the meaning of personal and aggregate right and wrong. In this realm, answers are sometimes hard to hear, and even more difficult to implement. But if we don't try, we risk leaping from WWII's Greatest Generation to the worst one.

Sample ClimateEthics post: A failure to increase research into alternative energy sources is unethical, in that it not only favors the current status quo in relation to energy infrastructure, and among other reasons, it increases the burden of costs for future generations in the both the clean-up of higher levels of atmospheric carbon as well as the inevitable costs to further innovate.

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Top Green Companies

A group of stalwart start-ups are turning clean technology into big business

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Top Green Websites

Covering Hollywood to the Hill, these 15 websites teach you everything you ever wanted to know about greening your life

Photo Essay

In the Time of Trees

Magnum Photographer Stuart Franklin has spent a decade exploring the beauty of trees and the unique place they occupy in man's world

Viewpoint

CO2: They Should Bottle That Stuff

Carbon capture is a crucial part of the global effort to stop warming. So, why hasn't it been implemented yet?

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The Greening of the Pentagon

According to a Pentagon-funded report, U.S. foreign dependence on oil, energy-inefficient troops and environmentally unfriendly forts threaten our national security

Environment | World

Lessons From Germany

Germans have slashed greenhouse-gas emissions without sacrificing profits. Their secret? Yep, efficiency. Here's what the U.S. could learn