The National Wildlife Federation Action Fund is giving its first-ever presidential primary endorsement to former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE.

The fund, the political arm of the National Wildlife Federation, credited Biden’s “collaborative, science-based leadership” style.

“We need a leader who will bring our nation together to enact bold solutions that confront the climate crisis,” the group said in a statement.

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“Throughout his career, Joe Biden has brought people from all backgrounds together to accomplish big things,” the statement added.

While Biden’s climate plan has gotten good marks from a number of environmental groups, it has consistently been ranked behind Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE’s (I-Vt.), which multiple groups have called the most ambitious.

Greenpeace’s candidate climate scorecard gives Sanders an A-plus, while Biden scored a B-plus.

But the fund credited Biden’s commitment to tackling the climate crisis within all sectors of society as giving him the edge.

”Vice President Biden knows that climate change is the existential threat of our time and will ensure America leads the world toward net-zero emissions,” the group said. “The Vice President won’t leave anyone behind — from coal miners to frontline communities suffering from environmental injustices.”

Biden thanked the group for the endorsement.

"We are facing a climate emergency that threatens our communities and wildlife alike. This emergency demands bold and decisive action," Biden said in a statement, adding that he would seek to "protect wildlife, protect our public lands and waters, and put our country on the path to net-zero emissions.”

Updated at 2:45 p.m.