Over the past three decades Congress not only has never passed any legislation to regulate climate change, but has specifically rejected legislation to give EPA the authority which it now claims.

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Plants provide invaluable services, they provide us with the very air we breathe, clean water and fertile soil and they help regulate the climate.

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Congress has never authorized the EPA to regulate GHGs for climate change purposes.

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Arctic ice helps regulate and temper the climate in many other parts of the world.

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Responding to a 2007 Supreme Court decision, Ms. Jackson has invoked the Clean Air Act to regulate carbon dioxide and other gases linked to climate change.

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What legislation gives the EPA authority to regulate vehicle fuel economy, or attach that issue to climate change?

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The endangerment finding gave EPA the power to regulate those gases even if Congress failed to pass laws to address climate change which Congress subsequently failed to do.

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Thanks to the Kyoto treaty on climate change, which came into effect in February, most rich countries regulate emissions of carbon dioxide in some manner.

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The Obama administration, meanwhile, has scrapped its efforts to push a climate bill through Congress, and is now mulling plans for the EPA to regulate CO2 emissions via the Clean Air Act.

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