President Barack Obama tried to revive his stalled climate change agenda on Tuesday, promising new rules to cut carbon emissions from U.S. power plants and other domestic actions...Obama also signaled he would block construction of the Keystone XL oil pipeline [proposed by TransCanada] from Canada if it contributed to climate change...Obama's long-awaited climate plan....drew criticism from the coal industry, which would be hit hard by carbon limits...Environmentalists largely cheered the proposals, though some said the moves did not go far enough...Obama's administration faces a long fight over his power plant proposals..."If the Obama administration fails to recognize...environmental progress...and continues to adopt more regulations, coal power could cease to exist, which would be devastating for our economy," said Mike Duncan, president of the American Coalition for Clean Coal Electricity.