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RE: What if there is no more land for farming, can we find an alternative? Let's say Hydroponics.
The estimated population in 2100 is mind-boggling. I guess we will then have to reclaim some part of the oceans and rivers to make a home for the teeming populace.
It might be necessary to do that with time. But there will still enough space for the population. My greatest fear though is the great deforestation that may happen when these teeming population arrives.