Environmental groups sue over pollution from airliners

WASHINGTON (AP) — A coalition of environmental groups sued federal regulators Tuesday over long-sought pollution standards for airliners and cargo planes.

The groups allege the Environmental Protection Agency has unreasonably delayed for years using the Clean Air Act to enforce limits on heat-trapping greenhouse gas emissions from aircraft.

Environmentalists have criticized that proposed reduction as too modest to significantly curb climate change, and are pushing the EPA to enact more stringent standards for domestic aircraft.

The Obama administration must act immediately to curb aircraft's significant contribution to greenhouse gas emissions worldwide.