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1. The explosion in the sub-Saharan Africa region is projected for the most growth in the future instead of India and China because demographers predict that in the sub-Saharan African region there will be more fertility among women, causing for the major growth rate in sub-Saharan Africa. Due to this explosion, sub-Saharan Africa will be the most populated countrie(s) by 2075, doubling time before 2100, meaning that supposedly before in sub-Saharan Africa it was projected that it would be the most populated countrie(s) in 2100, but doubling in time made it projected by 2075. The natural increase rate will cause the fertility of women in sub-Saharan africa to become more, causing the region to be the most populated region by 2075.
2. There is a lot of uncertainty among the two groups, but for the IIASA they believe that their projection for the future is correct, but it may be off by a little bit. For the UN they believe that no one can predict the correct population in the future, because it depends on the people and mainly women.
Explanation:
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