Answer:

According to an ongoing temperature analysis conducted by scientists at NASA's Goddard Institute for Space Studies (GISS), the average global temperature on Earth has increased by a little more than 1° Celsius (2° Fahrenheit) since 1880.

Which line is not a computer-generated forecast? How did the global surface temperature change between 1900 and 2000? It increased by about 0.7 °C. ... All of the computer-generated forecasts predict some global warming, but reducing the level of CO2 emissions will significantly slow the rate of increase.

• decade        °C                   °  F

• 1880      13.73                  56.71

• 1890      13.75                  56.74

• 1900     13.74                   56.73

• 1910        13.72                 56.70

• 1920      13.83                 56.89

• 1930      13.96                 57.12

• 1940      14.04                 57.26

• 1950      13.98                 57.16

• 1960      13.99                 57.18

• 1970      14.00                 57.20

• 1980      14.18                  57.52

• 1990      14.31                  57.76

• 2000      14.51                 58.12