Sara Underwood Blew Up Instagram For Earth Day in an Incredibly Skimpy Bikini

Totally natural.
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Totally natural.

We know Sara Underwood's thing is traveling the world and posing for photos in some of the most beautiful spots imaginable. So it only makes sense that she gifted her followers with a sexy Instagram post on Saturday April 22, a.k.a. Earth Day.

She captioned the pic with an earnest message stating that she was participating in one of the worldwide marches for science and wrote that "Our planet is at a critical juncture, and the science regarding it is under attack. Our voices matter, so I hope you get out and speak up for Planet Earth as well." 

Whatever your views on climate change, it's easy to appreciate the fact Sara is totally committed to nature and is so willing to reveal herself as she enjoys everything from the mountains to the Hawaiian islands. A few more shots from her Instagram below give us plenty of reasons to get into the natural world, especially when she's there.