Original sentence: A 1983 study by physicist Bernard Cohen proposes that uranium could be considered a renewable source of energy.Commonly sourced definitions of renewable energy sources treat solar energy as effectively inexhaustible, and omit or explicitly exclude nuclear energy sources as examples.It claims that fast breeder reactors fueled by seawater-extracted uranium could supply energy at least as long as the sun's expected remaining lifespan of five billion years, though fails to provide information on the amount of energy required to collect, extract, and process the uranium dissolved in seawater
Edited sentence: A 1983 study by physicist Bernard Cohen argues that uranium could be considered a renewable source of energy.Fast breeder reactors make much more efficient use of fuel than conventional reactors in common use.However, common definitions of renewable energy sources treat solar energy as effectively inexhaustible, and omit or explicitly exclude nuclear energy sources as examples.If renewable energy sources were defined as sources "available in undiminished quantity at present costs," as Cohen infers, uranium would meet that definition if used in fast breeder reactors.It calculates that fast breeder reactors fueled by seawater-extracted uranium could supply energy at least as long as the sun's expected remaining lifespan of five billion years