Four senators, including former presidential candidate Bernie Sanders, I-Vt., on April 27 introduced a bill that would transition the U.S. to 100% clean energy by 2050. Sanders, alongside Sens. Jeff Merkley, D-Ore., Senator Edward Markey, D-Mass., and Senator Cory Booker, D-N.J., created the legislation amid President Donald Trump’s efforts to unwind former President Barack Obama’s climate protections. The “100 by ’50 Act,” lays out a roadmap for the transition, and is the first bill introduced in Congress that envisions a 100% fossil fuel free U.S., according to a news release from Merkley’s office.