Exxon Mobil is leaving the American Legislative Exchange Council, or ALEC, a conservative nonprofit group that gets funding from fossil fuel companies.

Exxon disagreed with ALEC over climate change policy. In June, some ALEC members such as the Heartland Institute tried to encourage the group to adopt a draft resolution encouraging the federal government to challenge the so-called “endangerment finding.” The resolution failed to pass, and Exxon helped lobby to kill it.