Well sure, there must be a tipping point somewhere, but the earth has been a lot hotter in the past than it is now, and biomass was in much greater quantity at

Well sure, there must be a tipping point somewhere, but the earth has been a lot hotter in the past than it is now, and biomass was in much greater quantity at such times. It's glacial maximums that are really concerning to me personally. It's very unlikely that we could feed so many billions of people as we do now if we ever enter another ice age.