Climate sensitivity refers to how much the climate system responds to changes in greenhouse gas concentrations, particularly carbon dioxide. It is typically measured by estimating the amount of global warming that would result from a doubling of atmospheric carbon dioxide levels. Climate sensitivity is an important parameter for understanding and predicting future climate change impacts, and can vary based on factors such as feedback mechanisms, Earth's surface temperature, and changes in cloud cover. Many climate models use estimates of climate sensitivity to project future temperature changes and inform policy decisions related to climate change mitigation and adaptation.