Listen to Reese Witherspoon voice a new PSA fighting climate change.

Reese Witherspoon is the voice behind a powerful new PSA combating climate change.

She narrates the minute-long video seen below, which was produced by environmental group Conservation International and aired at the Momentum for Change Awards on Dec. 10, 2015, during the UN climate talks in Paris.

Her role as our "home" — as in, the world we all share — is making waves online.


Photo via Red Carpet Report on Mingle Media TV/Flickr.

The PSA serves as a commanding reminder that Earth might not need us, but we certainly need Earth.

With the entirety of humanity hanging in the balance, why aren't we prioritizing the protection of our planet?

It's a question Dr. M. Sanjayan, executive vice president of Conservation International, wanted to emphasize with the PSA.

"We wanted something that reminds everyone we have a shared planet," he told Mashable. "That everything we have, from our building materials, to our food, to the air we breathe and the water we drink — all of it comes from home. It's the earth itself reminding us."

GIFs via Conservation International/YouTube.

The PSA, part of Conservation International's #INeedNature campaign, is just the latest video getting some A-list traction behind it.

Just last month, Liam Neeson took on the role of "ice" for the initiative, and other celebs — including Kevin Spacey, Julia Roberts, Lupita Nyong'o, and Harrison Ford — have supported the cause, too.

Witherspoon's PSA comes at a time when climate change has never been more of a hot (pardon the pun) topic.

World leaders just met up in Paris and decided on a historic agreement to slash carbon emissions around the globe. Business leaders and philanthropists, realizing how vital the issue is, are investing billions of dollars in clean energy.

And more and more citizens around the globe are supporting organizations, like the Natural Resources Defense Council, that demand our leaders make combating climate change a #1 priority.

With Witherspoon now on board, this movement might just be unstoppable.

Watch the PSA narrated by Witherspoon below.

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