Colorado has some of the largest landfills in the country. Landfills are a source of methane, a potent climate pollutant, and other harmful air pollutants.

DOVER — The City Council approved spending $677,950 to monitor the water supply for contaminants after past pollution and to seek new sources of water as the city grows. Emery and Garrett Groundwater ...

Landfills are divided into “cells,” each of which is contained in a liner that keeps the trash isolated, according to Marvin ...