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Two prominent - and iconoclastic - environmentalists argue that current efforts to tax or cap carbon emissions are doomed to failure and that the answer lies not in making dirty energy expensive but in making clean energy cheap.

The Obama administration is expected to announce guidelines Tuesday that will toughen existing federal mileage standards. Automakers have signed off on the plan, sources say.

Article investigating the current state of LED lighting solutions. Studies suggest that a complete conversion to the lights could decrease carbon dioxide emissions from electric power use for lighting by up to 50 percent in just over 20 years; in the United States, lighting accounts for about 6 percent of all energy use. A recent report by McKinsey & Company cited conversion to LED lighting as potentially the most cost effective of a number of simple approaches to tackling global warming using existing technology.