Which of the following are overwhelming evidence of climate change?

1.In Alaska, Western Canada and Eastern Russia, average temperatures have increased by over 4 degrees Celsius during the past 50 years

2.Tropical regions have warmed much faster than the rest of the world

3.Mount Kilimanjaro has lost 85 percent of its famous ice cap since 1915

4.Over the last century the average global temperature has climbed 0.6 degrees Celsius

A1, 2 & 3 only

B1, 3 & 4 only ✓ Correct

C2, 3 & 4 only

D2 & 3 only

Correct answer: (B) 1, 3 & 4 only

Explanation

Sharp warming in high-latitude Alaska, western Canada and eastern Russia of over 4 degrees Celsius across fifty years is strong evidence of climate change.

Polar and high-latitude regions have warmed far faster than the tropics, so the claim that tropical regions warmed fastest is wrong.

Mount Kilimanjaro losing about 85 percent of its ice cap since 1915 signals long-term warming.

A rise of about 0.6 degrees Celsius in average global temperature over the last century is a documented trend.

Statement 1, Statement 3 and Statement 4 are valid evidence while Statement 2 is not.

This polar amplification is driven partly by loss of reflective ice and snow that exposes darker land and ocean.

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