The study clearly takes an extreme view point. I agree with your criticisms, and mostly it seems fairly poor science. I can see some benefit of looking for the

The study clearly takes an extreme view point. I agree with your criticisms, and mostly it seems fairly poor science. I can see some benefit of looking for the extreme though, it's looking for a theoretical optimum. I'd have thought they could do studies of land use in India for the most extreme possible switch.