The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

In the 1990s, the Environmental Protection Agency shut down thousands of leaky landfills, building larger ones with stricter environmental controls. Which means that if you do live near one, it’s likely to be a whopper: There were 8,000 landfills in the United States in 1988, and there are fewer than 2,000 today.
The （） of landfills has decreased.