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constraint
(often plural) something that limits your freedom to do what you want
contamination
the process of making something dirty, polluted, or poisonous by adding a chemical, waste, or infection
deplete
to reduce the amount of something or the number of things
dispose of
to get rid of something that you no longer need or want
elemental
powerful and basic, especially because of being connected with the forces of nature
emission
the act of producing or sending out something (such as energy or gas) from a source
extinction
the situation when an animal, plant, or language no longer exists
reservoir
a place where a liquid is stored
shrink
to become smaller in size
stable
not changing frequently and not likely to suddenly become worse
