Exploring human and natural influences on climate
Earth system models allow researchers to evaluate the size and strength of various influences on the climate system and identify the human contribution to the warming trend.
Earth system models allow researchers to distinguish “internal”
Taking into account all known external influences on the climate, the average global temperature change across model runs (red curve) tracks closely to actual observations (black curve)—indicating that the CMIP5 models can reproduce global climate processes fairly accurately. These comparisons support and strengthen the conclusions of the Intergovernmental Panel on
CMIP5 models include Earth system models from across the globe, the Community Earth System Model funded jointly by NSF and DOE, the Goddard Institute for Space Studies Model funded by NASA, and the Geophysical Fluid Dynamics Laboratory Model funded by NOAA.