Western states produced a whirlwind of climate initiatives last year, advancing numerous bills and regulations to reach net-zero emissions by 2050.

A Washington Supreme Court hearing provided a practice run for possible upcoming court battles over Gov. Inslee’s partial vetoes of recently passed climate bills.

Legislative leaders slammed Washington Gov. Jay Inslee’s veto of segments of cap-and-trade and low-carbon fuels standard bills.

The Washington Senate approved a bill that would require an increased use of biofuels to cut carbon emissions from vehicles.

Amazon threw its support behind a Washington state bill to trim carbon emissions from motor vehicle fuels sold in the state.