1.   The results could well be a sign of how greenhouse gas pollution will harm the high Arctic in years to come.

2.   These countries emit far less greenhouse pollution than industrialized nations now, but are expected to surpass many within two decades.

3.   But China and India, two of the biggest contributors of greenhouse gas pollution, have steadfastly refused to participate.

4.   The chief U.S. envoy to a global warming summit says he is encouraged by the pace of negotiations for enacting the Kyoto climate treaty curbing greenhouse gas pollution.