Question

During the 20th century, the global average temperature near the earth's surface increased about ________.

1) 0.5°C
2) 0.85°C
3) 1.25°C
4) 2.25°C

Answer 1

During the 20th century, the global average temperature near the earth's surface increased by about 0.8°C due to the enhanced greenhouse effect.

Step-by-step explanation:

During the 20th century, the global average temperature near the earth's surface increased by about 0.8°C. This increase in temperature is a result of the enhanced greenhouse effect, which is caused by the increase in atmospheric carbon dioxide (CO₂). Climate models predict that future global surface temperatures could rise by 0.3-4.8 degrees C before leveling off. It is important to note that the warming has been and will continue to be greater over land than over the ocean, and greater in the Arctic than anywhere else on Earth.