Trees have a little secret you might not know about. Yes, they produce oxygen. Yes, they take in carbon dioxide, a heat-trapping greenhouse gas. But, they also emit methane.
Methane is a greenhouse gas that can be significantly more potent than carbon dioxide.
“Just about every tree we measured had elevated amounts of methane in it. And that was consistent across the Northwest with a variety of different species,” says Nick Ward, a scientist with Pacific Northwest National Laboratory.