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Average global temperature has increased by about 1.1 degrees Celsius since the late 19th century. If the rate of warming is not in fact accelerating, rough extrapolations of the lowest and highest rates of warming derived from the observational records suggest that unabated global warming would further boost average temperatures between 1 and 1.6 degrees Celsius by the end of this century. Such an increase is in line with recent research that finds that the average global temperature is likely to rise by 2100 to about 2.2 degrees Celsius above the 19th century baseline. That's not nothing, but such an increase is unlikely to be catastrophic for future generations.