The bill would update the state's 2008 Global Warming Solutions Act by setting new emissions level requirements: 50 percent below 1990 emissions levels by 2030, 75 percent below by 2040, and net zero emissions by 2050.
The Global Warming Solutions Act requires the state to reduce its carbon emissions by at least 80 percent below 1990 levels by 2050.
The bill was filed jointly by Sen. Marc Pacheco, a Taunton Democrat and Representative Ruth Balser, a Newton Democrat.
Lawmakers last year proposed a bill that would press Massachusetts to achieve total renewable electricity generation by 2035 and phase out fossil fuels across all sectors, including heating and transportation, by mid-century.
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