You can achieve this goal just by changing energy use habits. Turn off outdoor lighting when not needed. Never leave outdoor lighting on overnight. Turn off lights when leaving a room. In summer, raise thermostats by 3-5 °F, or more when no one is home or during the night. In winter, lower thermostats by 3-5 °F, or more when no one is home or during the night.

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About Climate Change Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level. ...Most of the observed increase in globally-averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic GHG concentrations. It is likely there has been significant anthropogenic warming over the past 50 years averaged over each continent (except Antarctica). ...Delayed emission reductions significantly constrain the opportunities to achieve lower stabilisation levels and increase the risk of more climate change impacts. Intergovernmental Panel on Climate Change Fourth Assessment Report, 2007