Have you ever thought to yourself, "Man, oxygen is so cool. It lets me breath, it keeps my heart and lungs healthy, who do I have to thank for this stuff?"

Well the answer to that is simple. Oxygen is produced by photosynthesis, which is why trees and plants get a lot of their due credit here on land.

But wait ... there's more!

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Heroes

These stunning photos will remind you why trees are dope.

By the end, you just may want to hug a tree.

Trees are no joke.

"This better be good." Photo by Fabian Bromann/Flickr.

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Heroes

The Earth has a rhythm. During the summer, plants and algae grow and create oxygen. In the winter, some of the carbon dioxide they've absorbed is released back into the atmosphere.

It's almost as if the Earth were breathing.

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Natural Resources Defense Council