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President Obama came into office championing energy efficiency. But the biggest energy effort of his first two years — the cap and trade plan to reduce greenhouse gas emissions — never passed Congress. And the November election results mean cap and trade is off the table. But energy efficiency...

At the heart of the House and Senate climate-change bills is cap-and-trade, a complex system that, put very simply, requires companies to pay for their greenhouse gas emissions. Opponents of cap-and-trade like to call the idea cap-and-tax. But the preferred alternative to cap-and-trade, in the eyes of...

It’s too late to prevent all the harm that will be caused by climate change, say some experts, so we now have to start dealing with the new risks. The idea of adapting to shifts in the climate is gaining momentum in the face of evidence that climate change is already taking place, and will continue...

As a structure, the Empire State Building is about as far it as can be from the one-room schoolhouse. But the Manhattan landmark has taken on a little of the function of a little red schoolhouse. The Empire State Building is now a virtual classroom for lessons on how to plan and carry out energy upgrades...