Why is the US NOT the world leader in the problem of climate change?

Explanation:

This is more of an opinion based question, but I would say it's because we continue to produce massive amounts of pollution, and we have not taken much action into the problem at all. Countries that would be a leader in climate change would be much less populated, and limit their carbon emissions

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.