Lawmakers in the United States want to increase nuclear incentives and energy efficiency incentives in a guideline which would ask that utilities generate a particular amount of electricity from renewable energy sources, Reuters says. There is some contention as to whether nuclear power can be considered renewable energy. Uranium is the fuel which nuclear plants require to operate and uranium is a limited resource. Researchers say that in 30 to 60 years, depending on extent of demand, uranium resources will be depleted. Some scientists, politicians and others with any common sense question whether it makes any sense to continue to build nuclear plants when we may not be able to fuel them sixty years into the future. As much of a concern, incidentally, is the problem of storing the deadly radioactive waste thousands of years beyond the lifespan of the nuclear plants themselves. We would be leaving a legacy of deadly poisons to future generations to deal with and no benefit of energy from long-dead nuclear power plants.   Nuclear power is presently not considered renewable energy in the U.S. Senate Energy and Natural Resources Committee bill. The bill requires that a proportion of the utilities total power production would need to be committed to renewables. According to the amendment, energy production may be increased without increasing renewable power the plants would generate. It allowed plants to increase their production, without counting upgrades in the utilities electricity output. Several nuclear amendments were voted down by the panel. One amendment offered by Republican Senator John McCain of Arizona was one of the amendments voted against. His measure would have considered that all nuclear power was renewable energy. The bill would need power plants to reach targets to gradually produce more renewable power, beginning with 3 percent of their entire production between years 2011 and 2013 and a 15 percent rise between years 2021 and 2039.