The country of New Zealand has a pollution problem—but if you visit, you won’t notice it right away.
Instead, you’ll find a beautiful island nation in the Pacific Ocean. Snowy mountains rise high above the sea, and grassy hills roll across the land for miles.
Spend some time hiking the land, though, and you’ll smell the problem. Almost 30 million sheep and 10 million cows roam those green hills—and each one of them is farting.
That may sound like a dumb joke, but scientists aren’t laughing. Cows and sheep outnumber people eight to one in New Zealand, and they burp and fart about 4 million tons of gas every year.
That gas contributes to one of the most dangerous and serious problems we face today: global warming.