With congressional action on climate legislation in doubt, two House committee chairmen have filed a bill to block the government from regulating greenhouse gases under its own power.

The Environmental Protection Agency (EPA) cleared the way for regulation under air pollution laws a month ago, when it ruled that greenhouse gases endanger human health. EPA could act as early as March to offer regulations.

Efforts were being made in both chambers of Congress to derail EPA regulation. It normally takes months for Congress to agree on legislation.

Besides blocking EPA regulation of six gases, including carbon dioxide, methane and nitrous oxide, blamed for global warming, the House bill, which was filed on Tuesday, would remove two roadblocks to greater use of biofuels.

The bill, which would face a tough fight in Congress and be opposed by the president, would adopt a broad definition of biomass — including crops, trees, algae and manure — that can be used in making renewable fuels.

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