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Ernie Cultivating crops( not for biogas) has a duel purpose : They regulate the carbon cycle, thereby ensuring that global warming is not being exacerbated, and that food supplies are sufficient. Why would you want time and money invested into the installation of photovaltaic cells when you can do something that's not just more economical, but redresses (or at least tries to) two fundamental problems which are bound to be amplified ? Then again, there's always snags; capital would have to be invested into the research and potential development of climate-resistant crops.