A woman buys vegetables at a food market on January 9, 2008 in Beijing, China. (Photo by Feng Li/Getty Images)

An ultra-Orthodox Jew wears plastic bags over his shoes as he walks home after morning prayers through the snow January 30, 2008 outside Jerusalem's Old City in Israel. (Photo by David Silverman/Getty Images)

Pilgrims walk on plastic bags which are used to pack incense, candles and joss papers at a temple on February 7, 2008 in Chongqing Municipality, China. The Chinese Government has announced a nationwide ban on stores distributing free ultra-thin plastic bags from June 1, 2008. The new rule says all retailers have to clearly indicate the price of their plastic bags and charge customers for the bags. Chinese people use up to three billion plastic bags a day, which caused about 5 million tonnes of crude oil used to make plastic bags for packaging every year, according to reports. (Photo by China Photos/Getty Images)

Thousands of one-use plastic bags are left hanging on trees year-round in the Los Angeles River channel, after being washed by rains from streets and storm drains, on February 27, 2008 in Los Angeles, California. California stores dole out an estimated 19 billion lightweight plastic bags each year and most of them end up in landfills or storm drains which lead to estuaries and the ocean where they are often eaten by, or entangle, birds and wildlife with fatal results. (Photo by David McNew/Getty Images)

A farmer ploughs a field in front of a plastic carrier bag stuck in a hedge near Bath on March 4, 2008 in Somerset, United Kingdom. (Photo by Matt Cardy/Getty Images)

A lorry drives past a plastic carrier bag stuck in a hedge near Bath on March 4, 2008 in Somerset, United Kingdom. (Photo by Matt Cardy/Getty Images)

A plastic carrier bag hangs from a bush near a canal on March 4, 2008 in Birmingham, England. (Photo by Christopher Furlong/Getty Images)

Remnants of plastic snagged on barbed wire flutters in the wind on March 4, 2008 in Birmingham, England. (Photo by Christopher Furlong/Getty Images)

A plastic carrier bag floats in an ornamental fountain in the centre of Birmingham, England on March 4, 2008. (Photo by Christopher Furlong/Getty Images)

In this photo illustration a plastic carrier bag is blown along the road by the wind on March 4, 2008 in Birmingham, England. (Photo illustration by Christopher Furlong/Getty Images)

In this photo illustration a plastic carrier bag is blown by the wind on March 4, 2008 in Birmingham, England. (Photo illustration by Christopher Furlong/Getty Images)

A plastic carrier bag nestels amongst Spring daffodils on March 5, 2008 in Northwich, England. (Photo by Christopher Furlong/Getty Images)