Also, my data was 100% relevant because it incorporated technological advancement alongside of population growth! And even with technological advancement of massive proportions, the earth is still limited by size in many ways (which I have covered), and is limited in resources. The new technology will be very demanding in resources and will be limited as well.
Only 17% of earth's land surface remains unaffected by human beings.
Almost all usable agricultural land (3.7 billion acres, some sources say more, others less) is already being cultivated (remember, not all land is suitable to grow crops, and greenhouses will not be practical on a global scale), this number could increase (by approx. 13% at current technological growth levels) but would be resource dependent and therefore costly.
One acre of farmland grows enough food for two people for a year.. think about it.. there is only so far we can improve this statistic.