I recently learned that oil is mostly composed of algae and phytoplankton capturing carbon out the atmosphere thousands of years ago. Later the organisms fall to the bottom of the ocean and through time turn into crude hydrocarbons. So why do we not attempt to create the same crude oil by using alge with waste water from water processing plants?
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Ethanol can also be used as a fuel for internal combustion engines. The problem is that you have to put more energy in to making the fuel than you get out by burning it. Fossil fuels are effectively indirect long-cycle sources of solar energy.
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