The World Wildlife Fund has declared that global warming, a phenomenon that most scientists agree is caused by human beings' burning of fossil fuels, will create havoc among migratory birds by harming their habitats as a result of altering the environment.
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Aby harming their habitats as a result of altering the environment
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Bby altering the environment to the extent of it harming their habitats
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Cby altering the environment in ways harmful to their habitats
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Dfrom the fact that their habitats will be harmed by the environment being altered
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Efrom the fact that the environment will be altered and this will harm their habitats
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