The World Wildlife Fund has declared that global warming, a phenomenon most scientists agree to be caused by human beings in burning fossil fuels, will create havoc among migratory birds by altering the environment in ways harmful to their habitats.
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Aa phenomenon most scientists agree to be caused by human beings in burning fossil fuels,
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Ba phenomenon most scientists agree that is caused by fossil fuels burned by human beings,
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Ca phenomenon that most scientists agree is caused by human beings' burning of fossil fuels,
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Dwhich most scientists agree on as a phenomenon caused by human beings who burn fossil fuels,
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Ewhich most scientists agree to be a phenomenon caused by fossil fuels burned by human beings,
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