Coal and natural gas, both carbon intensive fuel sources, provide over 60% of the electricity available worldwide. Nuclear, hydro, wind and solar provide cleaner power, but the process of acquiring them is too costly for the average American. Instead, Marcus Hiles suggests smart and limited use of lights, refrigeration, entertainment and cleaning appliances. Simply switching from old, incandescent light bulbs to compact fluorescent lights can reduce up to 80% of the energy required to operate them, and new light emitting diodes (LED) perform even better. Fridges and freezers can be made more efficient by not setting them too cold, insuring they are properly sealed, are well defrosted, and located in the coolest area possible. Televisions, computers, phones and other technology should be turned off and unplugged when not in use, as even their standby consumption can be significant. Laundry machines and dishwashers often have very high wattage, and their necessity makes it difficult to limit their use. However, reductions can be made by selecting the coldest temperature possible, and by only washing full loads.