Civ 4 is one of my all-time favorite games and I still play online games of it to this day. After 10+ years of playing, I'm still discovering new game mechanics and new strategies. For those who don't follow civ, civs 1-4 consisted of a gradual expansion of concepts in each sequel, with tried-and-true mechanics being preserved, flawed mechanics being re-worked, and new mechanics building on top. This approach allowed the series to evolve and continue to improve with each iteration. Then came Civ 5 which abandoned most of the classic civ game mechanics and started fresh with a slate of new (and inferior, poorly balanced) mechanics. The predictable result was that Civ5 was a disaster. With Civ6, the designers have resumed a more evolutionary process, keeping the core of Civ5 but making significant improvements. Civ6 is pretty good but still no where near as good or deep as Civ4. I've always wished that civ4 would go open source so that a series of games could preserve and build-upon that lineage.

The degree to which the climate will change is not certain. Maybe it is too late to avoid significant climate change, but it probably isn't to late to take actions to mitigate the severity of the change.