Apparently, underwater worms that eat sediment burp out nitrous oxide, which causes climate change. They are not a problem now, because they are tiny and release little gas, but it's a problem that's been getting worse due to nitrogen-rich fertilizer flooding our waters, which the worms like to eat, and which makes them burp more.So now not only are all the cows we like to eat a problem, so are all the plants we like to grow. Worms, the new climage change criminal.