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These atmospheric changes have been paralleled by increases in global mean surface air temperatures (of between 0.3-0.6 ° C) and sea level rise (between 10-25 cm) over the past century . The temperature trend is statistically significant, and is considered unlikely to be of natural origin. Furthermore, the output of climate models that incorporate the effects of greenhouse gases and tropospheric aerosols show similar temporal and spatial patterns to those seen in historical climate data. These observations support the conclusion that, despite remaining uncertainties:

"The balance of evidence suggests that there is a discernible human influence on global climate” (IPCC, 1996) .