RE: Will humans go extinct in 100 years?
There will be a lot of deaths but I don't believe extinction will occur within 100 years. However, if we don't make a serious move for expansion into outer space, I suspect extinction of homo sapiens will occur within a thousand years.
1. We do not make war because of politics. Politics is simply how we act and react as groups (We use politics to stop wars, too). Wars start because of lack of resources. This lack occurs for one of two reasons: losing resources (drought, etc [bad weather]) or having too many people [good weather]. The history of humanity is told as a series of human-caused events such as this king declaring that war, but it can also be told as a series of reactions to cold weather (the fall of Rome) or too much success (cutting down all the trees--both Greek civilizations).
2. Over the long-term, we have 4 choices as a species.
a. Extinction
b. Perfect sustainability (births=deaths and the number of people matches the agricultural-technical resources available).
c. continue as we have been with populations expanding to the limits of resources then dying back (via war, famine, genocide, epidemic or natural disaster) to a population that matches available resources
d. We expand into space and begin using the resources there.
Option b Steady State is unlikely.
Option c Dynamic State is not long-lasting now that humans cover the entire planet. Diebacks will occur regularly and one of those will eventually coincide with a natural disaster or epidemic in our wheat or rice and result in the eradication of Mankind.
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These options have nothing to do with the age of the analyst. Nor are they affected by the depth of your belief in God or Allah or Buddha. Nor are they subject to the whims of kings, dictators, or even a plurality of voters.
