In terms of climate change the individual has a real role to play. For instance if every person on the planet saved one kilowatt hour of power a week from their daily lives the effect would be equivalent to eight billion units or eight million megawatt hours! In terms of conventional plants (say 250 MW capacity producing say 40,000 MWhours per week) this would avoid the carbon footprint of some 200 power plants!!!
For most of us in the western world the loss of one kilowatt hour of power is negligible yet the accumulated gain for the environment is very tangible.