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The solid lines are based on observations smoothed to remove the effects of inter-annual variability (light lines connect data points). Data in most recent years are obtained from satellite-based sensors. The envelope of IPCC (2001) projections is shown for comparison; this includes the broken lines as individual projections and the shading as the uncertainty around the projections.
Look for ways to reduce the energy consumption for heating and cooling, for example by sealing windows and doors, insulation or changing the windows. Today it is possible to build ‘carbon neutral’ houses.
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