Low Impact, High Yield, Is What We Really Need

We should be considering what the numbers tell us. Low impact, high yield is what we desperately need to be looking for if we are to feed the world without devouring the planet. But the detail matters. One of your recommendations, for example, as i understand it, is the perennial crops replacing those that have to be annually planted and reared. All of the evidence i have seen suggests that by year three or four, these perennial crops are yielding in much reduced ways. So there's only one which has been fully commercialized so far. That's a rice variety called p r 23, which is being widely grown now in southern china. And so far there've been six har