Examlex
Production of renewable energy is less expensive than production of coal.
Homeland Security
A concerted national effort to prevent terrorist attacks within the United States, reduce the country's vulnerability to terrorism, and minimize the damage from attacks that do occur.
Nuclear Fission
A nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, releasing energy.
Radioactive Waste
Waste material containing radioactive substances which poses serious risks to human health and the environment if not properly managed.
Petroleum
A liquid mixture of hydrocarbons present in certain rock strata, used for fuel and as a raw material in the chemical industry.
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