Washington Gov. Jay Inslee launched a 2020 run for president Friday making a bet untested in American politics: that a single-issue platform of fighting climate change can win.

He kicked off his campaign with a launch video in which he warned, in emotional terms, that the effects of the climate “crisis” are “being felt everywhere,” as video footage flashed of blazing wildfires and waste-deep floods. He also promised “millions of good paying jobs” in a clean energy economy.