1/3 of the planets land area is used for what purpose?

Ineed asap i will give 30 pointsps: the last word says splits

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire

Which two nations are doing the most to combat their environmental issues?