I was surprised, too. The former congressman from Texas, whose campaign has previously been somewhat skimpy on policy proposals, debuted on Monday a $1.5 trillion proposal meant to rapidly move the economy away from fossil fuels and slow the advance of climate change.

“We will ensure we are at net-zero greenhouse-gas emissions by the year 2050, and that we are halfway there by 2030,” O’Rourke said in a…