In recent years, scientists all around the world have come to terrifying conclusion. Global warming is a
real problem, and one lastly caused by human activity. But as experts debate how to solve the problem, ice
in moutains such as Chacataya, and near the North and South Poles, is melting faster than even the most
pessimistic environmentalists once feared. Ten years ago, scientist warned that the Arctic Ocean could lose
all its ice in about a hundred years. Now, they think it could happen much sooner. As climate scientist Mark
Serreze puts it, “Reality is exceeding expectation.”