i don't think so. truth to tell, i don't have many callouses on my hands, either. >> tracy: but this land outside nashville is also gore's climate change laboratory. >> and then just push it in. >> tracy: he's collecting a soil sample as he experiments with what's known as regenerative farming. >> that means cut back on the plowing. there are better ways to plant. >> tracy: there's actually three times more carbon stored in the topsoil of the earth than all the trees and plants combined. by plowing less and making that soil more fertile, scientists say farmers could help trap massive amounts of addition planet-warming carben emissioning in the ground. >> job number one is to stop using the sky as an open sewer for all of this manmade global warming pollution. and that's what's making the weather crazy and dangerous. >> tracy: he says mother nature is now making the most effective argument for climate action, and he's encouraged by the rapid growth of solar and wind power. but the planet is still rapidly