Humanity as a whole must replace our obsolete energy resources with newer, more efficient, less wasteful and destructive sources. Oil, coal, lead-acid batteries, and many other high-risk sources are already being replaced by cleaner, safer methods of creating and storing energy. Semi-renewable sources such as biofuels and collected methane are being implemented to clean up waste from agricultural sources. Renewable sources such as hydropower and solar power are also being implemented, but they are too expensive to maintain, generate a high waste rate in the event of failure, and do not produce enough energy to meet the needs of the population. 'a large population. We need to convert to more efficient forms of heat engines and safer nuclear power, otherwise we will run out of energy due to the inefficiency of the sources we currently use. If safer nuclear power plants were implemented using a less hazardous source than plutonium and hydrogen, such as thorium and liquid fluoride, we could rely solely on energy production from thorium, which is readily available and inexpensive to renew. This combination is used to eliminate the danger associated with the use of plutonium and hydrogen, caused by the hydrogen atom which, when used in a nuclear reactor or heat engine, can split and cause an explosion made worse by the propagation of large amounts of radiation. Both of these phenomena can render large areas uninhabitable and take centuries to clean up. Among our resources, coal, oil, and lead-acid batteries are our most wasteful and dangerous sources of energy. Their mobile, capable of being compact and high energy, makes them almost indispensable to the life of a technologically advanced people. The amount of energy they produce is more than enough for us to live comfortably...... middle of paper ......tml#c1> August 2000. 12/11/2013."Oil production and gas Waste » Environmental Protection Agency 08/30/2012. 10/12/2013.Pottinger, Lori. “Environmental impacts of large dams: African examples” International Rivers 10/1/1996. 11/12/2013.Union of Concerned Scientists. “Environmental impacts of hydroelectric energy” UCSUSA 05/03/2013. 11/12/2013>Woody, Todd “Solar was America's only new energy source in October” The Atlantic. 11/26/2013. 12/11/2103.