Chapter 2 | Our Changing Climate
Key Message 1 2 Ch 2 Our Changing Climate Global climate is changing rapidly compared to the pace of natural variations in climate that have occurred throughout Earths history Global average temperature has increased by about 18F from 1901 to 2017 and observational evidence does not support any credible natural explanations for this amount of warming instead the evidence consistently points to human activities especially emissions of greenhouse or heattrapping gases as the dominant cause
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