No Doubts Global Warming Is Real, US Experts Say: "New evidence found by teams of climate researchers leaves no doubt that industrial emissions of greenhouse gases are responsible for increasing global temperatures -- an ominous trend that has speeded up in the past 50 years and threatens to continue for centuries, according to a report by two of the nation's leading atmospheric scientists.

"The two government experts said climate change 'may prove to be humanity's greatest challenge' and warned that 'it is very unlikely to be adequately addressed without greatly improved international cooperation and action.'"

No Doubts Global Warming Is Real, US Experts Say: "New evidence found by teams of climate researchers leaves no doubt that industrial emissions of greenhouse gases are responsible for increasing global temperatures -- an ominous trend that has speeded up in the past 50 years and threatens to continue for centuries, according to a report by two of the nation's leading atmospheric scientists.

"The two government experts said climate change 'may prove to be humanity's greatest challenge' and warned that 'it is very unlikely to be adequately addressed without greatly improved international cooperation and action.'"