although rock we could argue that the best option would be to let nature run its course if humanity is to be ultimately wiped out why not let it happen naturally,then again is that option still available given that the timeline has been dampered with ,with the reintroduction of 4400 in the past...
this reminds me of terminator i always wondered about the fact that john send a comrad back to the past to help his mom only for that guy to be the one who fathers him :
The Terminator (1984) In the Year of Darkness, 2029, the rulers of this planet devised the ultimate plan. They would reshape the Future by changing the Past. The plan required something that felt no pity. No pain. No fear. Something unstoppable. They created 'THE TERMINATOR'
Judge Dredd (1995) In the future, the Earth transforms into a desert wasteland called "The Cursed Earth". Crowds of people now live within walled "Mega Cities" where crime is out-of-control and elite police forces (The Judges. Judge, Jury and Executioners all in one) enforces law and justice in the Mega Cities. The Year is 2139. The Planet Earth has changed into a virtually uninhabitable place called the "Cursed Earth". All of the Earth's population have crowded into the cities across the planet...
just thought i'd show how this theme is common in sci fi/futuristic films,seems like a common idea on which writers agree the world is heading to chaos and poverty(not only financially) ressources are s scarce,the is inequality between haves and haves not,accentuated by discrepancy between mega walled cities(civilized!) and outside(lawless wasteland and rebel-land)
between the dreaded prospect of earth natural ressources shrinking and global warming it is not such a far-fetch conclusion plus the lifestyle of cities as oppose to countryside what could possibly changes us from our present course ...4400?