Water floods a street Wednesday, Sept. 1, 2021, in Bridgeville, Pa. (Andrew Rush/Pittsburgh Post-Gazette via AP)AP

Gov. Tom Wolf vetoed a legislative effort to block Pennsylvania’s entry into the Regional Greenhouse Gas Initiative (RGGI), a multi-state cap and trade program the governor has made the biggest piece to date of his second-term plunge into the fight to limit global warming by reducing carbon emissions from power plants.

Wolf’s goal has been to get Pennsylvania into RGGI this year, before he leaves office in next January, helping to address what he sees as an existential threat to life as we know it in the Keystone State.