# Plain Language Summary: Adopt GREET Act

This bill requires the Environmental Protection Agency to update how it measures the environmental impact of renewable fuels. Right now, the EPA uses a specific method to calculate how much greenhouse gas pollution is created when producing and using different types of renewable fuel—things like ethanol made from corn or biofuels made from other sources. The bill says the EPA needs to refresh this measurement system to make sure it's using the latest science and data, starting within 90 days of the bill passing and then every five years after that.

For the first update, the EPA must adopt a specific tool called the GREET model, which was developed by Argonne National Laboratory and is considered one of the most advanced ways to measure the true environmental cost of different fuels from start to finish. This model looks at everything involved in making and using a fuel—from growing the crops, to processing them, to transporting the final product. After that first update, the EPA can choose to keep using GREET or switch to another method if they believe it's more accurate based on newer research.

The practical effect of this bill is that renewable fuel producers and the EPA will be working with more current information about whether these fuels are actually better for the environment than traditional gasoline. This could affect which fuels get approved for use, how much of certain renewable fuels refineries are required to blend into gasoline, and ultimately what fuel options are available at gas pumps. For farmers and renewable fuel companies, particularly in agricultural states, this could influence the demand for their products and the value of renewable fuel credits in the market.