For eons, nature has relied on photosynthesis as a big way to keep carbon dioxide levels from getting out of control. But as we have put more carbon into the air, we've also cut down many of the forests we need to suck that carbon up. So big tree-planting initiatives like #TeamTrees to the rescue, right? Actually, we need to think bigger. Here are three ways trees can help us solve climate change. [10:44]