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Understanding America's ethanol policy

The Trump administration is gearing up to release by Thursday what is likely to be the biggest environmental regulation issued all year, driven by a 12-year-old law with a mixed record of success.

Driving the news: The Environmental Protection Agency faces a Nov. 30 deadline to issue quotas for how much biofuels refineries must blend into the gasoline supply under a federal mandate called the renewable fuel standard. Refineries are meeting the mandate now mostly by blending corn-based ethanol, though Congress had far greater ambitions for non-corn biofuels when it first passed the law, as the chart shows.

Data: Energy Independence and Security Act of 2007, Environmental Protection Agency; Note: Advanced biofuel includes biodiesel and cellulosic biofuel. Chart: Lazaro Gamio / Axios