During a recent virtual fundraiser focused on climate action, former vice president Joe Biden made a direct appeal to voters young enough to be his grandchildren. “I want young climate activists, young people everywhere, to know: I see you. I hear you. I understand the urgency, and together we can get this done,” said the 77-year-old Democrat, who days earlier had announced a $2 trillion plan to combat climate change and environmental racism — the most ambitious blueprint released by a major party nominee for president. The moment marked a shift months in the making.

Biden had rolled out a proposal during the primaries — a $1.7 trillion plan that aimed to make the nation carbon neutral by 2050 — that did not impress many young activists who view climate change as an existential crisis.

The youth-led Sunrise Movement gave Biden an “F’ rating, saying his plan lacked detail and paled in comparison to the aggressive action proposed by rivals such as Sen. Bernie Sanders (I-Vt.) and Sen. Elizabeth Warren (D-Mass.), who had embraced the far-reaching Green New Deal.

Over three months, the campaign invited ideas from the young climate crusaders, union officials, environmental justice leaders and former Democratic rivals.

The result was a more aggressive and extensive plan that called for the elimination of carbon pollution from the electric sector by 2035, rejoining the international Paris climate accord and spending $2 trillion over four years to boost renewables and create incentives for more energy-efficient cars, homes and commercial buildings.