The document is an email summarizing a news article about a Senate hearing on climate change policies. At the hearing, four Bush administration advisors defended the President's decision to withdraw from the Kyoto Protocol and pursue voluntary emissions reductions programs instead of mandatory caps. They argued mandatory cuts could cost billions and millions of jobs. Critics at the hearing said the administration's approach will not reduce emissions and is inadequate given warnings about climate change impacts. The administration officials said more study is needed before taking more aggressive action.