In essence, the 648-page draft opens what promises to be a lengthy and contentious debate in Congress over the proper regulatory framework to address climate change, and how to best advance national clean energy development and energy efficiency.

While Obama’s party has a comfortable majority in the House of Representatives, the bloc is sharply divided over those issues.

Republicans have already lined up in opposition to most of Obama’s environmental policies, which they contend will raise energy costs for consumers struggling with a recessionary economy and leave industry less competitive in global markets.

Representatives