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In the passage, several alternatives that could be used to replace fossil fuels are discussed but ----.
In recent years, scientists have come to an
agreement that the Earth is warming mostly due to
the emission of carbon dioxide from electrical power
plants that burn coal, oil and natural gas. Discussions
of alternatives to these fossil fuels generally include
windmills, photovoltaics (panels which convert
sunlight to electricity) and even hydrogen fuel.
Although these technologies hold a great deal of
promise for the long term, none of them provides an
immediate solution to the problem of global warming.
Even if these new technologies fulfill their potential at
some time in the future, it is unclear whether they will
meet the world's energy needs. For this reason,
nuclear power still remains the only really attractive
alternative to fossil fuels.