[Answer] The Trump administration this week completed a rollback of an Obama-era environmental rule affecting what?

Step 1 : Introduction to the question "The Trump administration this week completed a rollback of an Obama-era environmental rule affecting what? "

...1. Agricultural runoff
2. Automobile fuel efficiency
3. Coal plant emissions
4. Offshore drilling

Step 2 : Answer to the question "The Trump administration this week completed a rollback of an Obama-era environmental rule affecting what? "

Automobile fuel efficiency:

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A new rule announced on Tuesday rolls back a 2012 standard, put in place by the Obama administration, that had required automakers to cut planet-warming tailpipe pollution by selling vehicles that reach an average fuel economy of about 54 miles per gallon by 2025, replacing that with a standard of 40 miles per gallon. Multiple states are preparing to file a joint lawsuit against the rollback in what is expected to become a landmark case before the Supreme Court. Here’s a look at some of the environmental rules and regulations that have been rolled back under President Trump.

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