Carbon-intensive fuel sources such as coal and natural gas contribute to over 60% of the electricity available worldwide. Nuclear, hydro, wind and solar are relatively cleaner sources of power, but the technique of getting them is too costly for the usual American. As a substitute, Marcus Hiles endorses the smart and limited use of lights, refrigeration, entertainment and cleaning appliances. Just by swapping old, incandescent light bulbs for compact fluorescent lights, energy needed for working can be reduced to 80%. Moreover, new light emitting diodes (LED) are even better options. Fridges and freezers can be made to work better by not setting them too cold, making sure they are correctly sealed, are well defrosted, and positioned in the coolest area possible. Also, televisions, computers, phones and other technology should be switched off and unplugged when not in use, as even their standby use can be drastic. Laundry machines and dishwashers usually have very high wattage; their high need makes it difficult to limit their use. However, by selecting the coldest temperature achievable and by only washing full loads reductions in energy consumption can be surely made.