science > more Frequently Asked Questions (FAQ) > Are humans really causing climate change? >

This figure compares the observed changes in surface temperature from 1901–1950 with results from climate models using natural and human forcings.

• Black lines show observed average temperatures
• Blue shaded bands show the 5–95% range for 19 computer simulations from 5 climate models using only the natural forcings due to solar activity and volcanoes.
• Red shaded bands show the 5–95% range for 58 simulations from 14 climate models using both natural and human forcings.

This is FIGURE SPM-4 from the IPCC document Climate Change 2007: The Physical Science Basis, Summary for Policymakers, formally approved at the 10th Session of Working Group I of the IPCC, Paris, February 2007, page 11