There is a theory that says if we all switch off our sockets when not in use we will conserve energy and have a large impact on CO2 emissions. This depends on everyone doing this. What actually happens is that saving energy by doing that saves very little. What we need is to make big savings.
The biggest saving is not to drive your car. That saves a lot of energy. It also keeps you fit.
Then there is an even better option. Utilise the renewable energy around you. If you want to learn about how to do that and how the various technologies work visit http://www.perimetrfilms.com