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Q: “Are we doomed?” A: “We would be, if not for the amazing developments in renewable energy.”
(powering-the-planet.ghost.io)
This is a most excellent place for technology news and articles.
The world population is going to stop growing, naturally, within the next decades as the last populous countries finish their demographic transition. It's even going to see a reduction in many places unless steered against due to way below placement rate fertility. Long story short human fertility is intimately tied to child mortality: The fewer children die, the fewer kids we have, investing in quality over quantity.
The earth can easily sustain that population, even in a more fucked up state.