grasslands

Humans transport some non-native species on purpose. Others arrive by accident. The vast majority don't hijack landscapes. But those that do comes with high stakes.

We normally think of trees as being good for the environment. But in parts of the Midwest and Great Plains, they're actually heating up the earth as woodlands take over grasslands.

Seas of corn and wheat stretch out across the High Plains, but a huge portion of those fields used to be native grassland. To conserve what’s left, a new program will work with ranchers, and it’s backed by some of the biggest beef buyers like Burger King.