Much of the Solid Waste That People Throw Away Goes

Much of the solid waste that people throw away goes to landfills. Which of the following is true about landfills?

A) In the U.S., they are the third largest source of human-caused methane emissions.
B) When precipitation percolates through the contents of a landfill, it creates a liquid mixture that carries contaminants to bodies of water.
C) One way landfills are an ecological threat is that they claim acreage that might otherwise serve as wildlife habitat.
D) All of these statements are true about landfills.