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Petroleum Alternatives

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a constraint
a restriction
a contamination
addition of a germ or hazardous substance
to deplete
to decrease the supply of a resource or material
to dispose of
to get rid of
in terms of elements; basically
an emission
a substance discharged into the air
an extinction
complete disappearance
a reservoir
a place where a liquid is stored
to shrink
to become reduced in size
firm and dependable