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.

Washington is on its way to becoming the second state to have a comprehensive cap-and-trade program after a Senate vote approving the bill.