And he certainly was a big spender, yet that didn' t work either.

But they are large polluters themselves and their interests differ from very poor states and islands.

But the country's drive thus far has met with limited success, in large part because of opposition in regions where those smaller producers are still big employers.

America is a big user of oil, compared with fuel-efficient Europe, so more dollars than euros flow into the oil-exporters' coffers when oil becomes dear.

He has moved unilaterally to limit greenhouse gases from vehicles and large sources such as coal-burning power plants.