Question

7. The greenhouse effect* (mcp)

increases Earth's average surface temperature by about 5 degrees Celsius (9 degrees F)
increases Earth's average surface temperature by about 10 degrees Celsius (18 degrees F)
increases Earth's average surface temperature by about 15 degrees Celsius (27 degrees F)
increases Earth's average surface temperature by about 20 degrees Celsius (36 degrees F)
increases Earth's average surface temperature by about 35 to 40 degrees Celsius (63 to 72 degrees F)

Answer 1

The greenhouse effect increases Earth's average surface temperature by about 15 degrees Celsius (27 degrees F).