Let's say you're an environmentally motivated eater. You want your diet to do as little damage as possible to our planet's forests and grasslands and wildlife.
But how do you decide which food is greener?
Take one example: sugar. About half of America's sugar comes from sugar cane, and half from sugar beets. They grow in completely different climates. Sugar cane is a tropical crop, and sugar beets grow where it's colder and dryer.
Each one has an impact on the environment — sometimes a dramatic impact — but in very different ways.