Observational and model studies of temperature change, climate feedbacks and changes in the earth's energy budget together provide confidence in the magnitude of global warming in response to past and future forcing
Human influence has been detected in warming of the atmosphere and the ocean, in changes in the global water cycle, in reductions in snow and ice, in global mean sea level rise, and in changes in some climate extremes
This evidence has been the dominant cause of the observe warming since the mid 30 century