This is debatable. Melting ice is the greatest indicator of global temperature. Melting ice can be considered the greatest problem because of its global effect with rising sea levels. All coastal cities can be devastated with the estimated 7 to 82 cm rise in sea level by the end of the century. Melting ice is even a greater problem considering that melting is a positive feedback system. Ice normally reflects sunlight instead of absorbing it. But as global temperatures rise, so do ocean temperatures and ice melts easier. The dark water absorbs more light more readily, allowing ice to melt at faster rates. Ice melt can be the worst problem considering its global magnitude. Global warming also results in increasing occurrences of droughts.
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