As Canada, the United States and other countries look to crops as possible future sources of energy, some researchers are calling for caution, citing the possibility of some biofuel crops becoming invasive species. The scientists argue that before these crops are widely planted, further ecological studies of biofuel crops are needed. Biofuels (derived from processing these crops) are looked at by many environmentalists as a way to reduce our reliance on non-renewable oil and gasoline.

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