Fuel sources high on carbon such as coal and natural gas add up to over 60% of the electricity available worldwide. Nuclear, hydro, wind and solar are cleaner sources of power, but the process of getting them is too costly for the usual American. As an alternative, Marcus Hiles recommends smart and restricted use of lights, refrigeration, entertainment and cleaning appliances. By merely switching from old, incandescent light bulbs to compact fluorescent lights, energy usage for operation can be decreased up to 80%, and new light emitting diodes (LED) are even better options. Fridges and freezers can be made more optimal by not setting them too cold, making sure they are correctly sealed, are well defrosted, and positioned in the coolest area possible. Televisions, computers, phones and other technology must be turned off and unplugged when not in use, as even their standby use can be major. Laundry machines and dishwashers mostly have very high wattage, and their need makes it difficult to limit their use. However, cuts in energy consumption can be made by selecting the coldest temperature achievable, and by only washing full loads.