I'm not sure what to make of the grassland angle. It works well for the reindeer scenario, given the reindeer have always been with that ecosystem. However, how

I'm not sure what to make of the grassland angle. It works well for the reindeer scenario, given the reindeer have always been with that ecosystem. However, how well does that scale to production levels we need to support 8 billion people? I also wonder how well that translates to other areas. I understand we've pretty much destroyed the American prairies. Not sure about the details of that though.