Atmospheric GHG concentrations can be related to changes in global mean temperature by the climate sensitivity. Projections of future global warming are affected by different estimates of climate sensitivity. For a given increase in the atmospheric concentration of GHGs, high estimates of climate sensitivity suggest that relatively more future warming will occur, while low estimates of climate sensitivity suggest that relatively less future warming will occur. Lower values would correspond with less severe climate impacts, while higher values would correspond with more severe impacts.