Biofuels is a rather controversial topic if you read about emissions guidelines and the errors in the accounting of greenhouse gas emissions. He highlighted a few areas that the world needs to look at/study. More efficient cropland (increase yields or even look at what crop yields are...the data is terrible or unavailable), catalogue of "other" land and development of new fertilizer production with slow release nitrogen.
Final words: Don't forget the "D" in R&D
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