The gases, the agency says, contribute to air pollution and may endanger public health or welfare.

BBC: Obama diary: Days 81-90

The law mandates that the EPA shall regulate any pollutant from motor vehicles or power plants that may reasonably be anticipated to endanger public health or welfare.

NPR: Supreme Court Hears Global Warming Arguments

It concluded it would lead to an increase in flooding, and would endanger water quality and public health.

ECONOMIST: The poor pay for a property boom