Climate model

A climate model is a simplified numerical simulation of the climate. The climate is generally not considered predictable, because we cannot yet predict future solar behavior or volcanic activity and not all the internal processes of the climate are well understood.

Climate scientists attempt to validate or prove the skill of the models by tuning them to match observations of the climate. Currently the most advanced climate models, still disagree by more than a factor of two in their sensitivity to greenhouse gas forcing, and have significant disagreements with observed climate behavior at high latitudes.

They are, therefore, utterly unable to project the change of climate in response to future greenhouse gas scenarios.

All the models are claimed to have good agreement with the 20th century temperature trends, yet are acknowledged to have significant errors.