As it turns out, in 1986, Joe introduced Cogress's 1st ever Climate Bill in the Senate

[LongtimeAZDem]

4. Two years before Dr. James Hansen's testimony on Global Warming:

Introduced in Senate (09/29/1986)
Global Climate Protection Act of 1986 - Directs the President to establish a Task Force on the Global Climate to research, develop, and implement a coordinated national strategy on global climate. Requires such Task Force to transmit a United States Strategy on the Global Climate to the President within a year. Requires the President to then report to specified members of Congress on such report.

Directs the President to appoint an ambassador at large to coordinate Federal efforts in multilateral activities relating to global warming.

Directs the Secretary of State to promote the early designation of an International Year of Global Climate Protection.

Urges the President to give climate protection high priority on the agenda of U.S.-Soviet relations.

Too bad the Green New Dealers aren't excited by him. Of course, Biden introduced this three years before AOC was born.