Pressure mounts for halting plastic bags

But US stores not acting fast enough, scientists and environmentalists say

US citizens use at least one every day - about 380 billion each year. And those plastic shopping bags, made from depletable resources that hardly ever break down, have been finding their way into oceans and marine animals.

Supermarkets and other stores in the United States giving customers plastic bags at checkouts are responding to growing pressure to eliminate the bags. But scientists and environmentalists say they aren't moving fast enough.