Fuel sources full of carbon such as coal and natural gas contribute to over 60% of the electricity available worldwide. Nuclear, hydro, wind and solar are mostly cleaner sources of power, but the procedure of getting them is too costly for the usual American. As a substitute, Marcus Hiles recommends clever and restricted use of lights, refrigeration, entertainment and cleaning appliances. By simply switching from old, incandescent light bulbs to compact fluorescent lights, energy needed for working can be reduced to 80%, and new light emitting diodes (LED) are even better options. Fridges and freezers can be made to work more effectively 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 should be switched off and unplugged when not in use, as even their standby use can be major. Laundry machines and dishwashers usually have very high wattage; their indispensability makes it difficult to limit their use. However, reductions in energy consumption can still be made by selecting the coldest temperature achievable, and by only washing full loads.