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Why is climate changing?

Graph The earth is surrounded by layer of gases that keep its surface warm and able to sustain life. Since industrialization, this layer has grown thicker due to increased commercial activities and pollution due to which the greenhouse gases have caused an increase in the average temperature in the atmosphere.

This graph shows how annual average temperatures worldwide have changed since 1901. Surface data come from a combined set of land-based weather stations and sea surface temperature measurements. Satellite measurements cover the lower troposphere, which is the lowest level of the Earth's atmosphere. "UAH" and "RSS" represent two different methods of analyzing the original satellite measurements. This graph uses the 1901-2000 average as a baseline for depicting change. Choosing a different baseline period would not change the shape of the data over time.

Data source: NOAA, 2016