All of these yield consistent estimates of the approximate magnitude of global warming, which reached about 0.8 °C in 2010, twice the magnitude reported in 1981. (data.giss.nasa.gov)
Also important is the fact that different GCMs yield different regional climate change patterns, even for similar magnitudes of global warming (see Chapter 10). (ipcc.ch)
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. (dotearth.blogs.nytimes.com)