The issue of climate change received a fair amount of attention on the first day of the Democratic National Convention (DNC).

Bernie Sanders reaffirmed his endorsement of Hillary Clinton, saying, "This election is about climate change, the greatest environmental crisis facing our planet, and the need to leave this world in a way that is healthy and habitable for our kids and future generations. Hillary Clinton is listening to the scientists who tell us that—unless we act boldly and transform our energy system in the very near future—there will be more drought, more floods, more acidification of the oceans, more rising sea levels."

Check out this sick burn that @berniesanders landed on the media last night at #DNCinPHLhttps://t.co/ehCvyfXdbg — Independent Journal (@TheIJR) July 26, 2016

Sen. Elizabeth Warren mentioned how huge energy companies have been allowed to destroy the environment due to governmental dysfunction and how a lack of unity among citizens allows oil companies to "fight off clean energy."

Al Gore also endorsed Clinton based in part on her climate stance.

I am not able to attend this year’s Democratic convention, but I will be voting for Hillary Clinton. (1/3) — Al Gore (@algore) July 25, 2016

Given her qualifications and experience — and given the significant challenges facing our nation and the world, (2/3) — Al Gore (@algore) July 25, 2016

including, especially, the global climate crisis, I encourage everyone else to do the same. (3/3) — Al Gore (@algore) July 25, 2016

During the day, environmental groups, business groups and politicians gathered for eventsoutside the DNC in Philadelphia to discuss climate change and politics.

For a deeper dive:

News: Grist, Vox, State Impact, CNN, Politico, Huffington Post, Bloomberg

Commentary: Slate, Eric Holthaus column; New York Times editorial

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