Venus by Tuesday: Welcome to Day Zero (Population: Millions)

This, and it's the capital city of a country with worldwide relevance. If Iran is very lucky, the best case scenario is that Tehran never should have been there in the first place because it was always an unsustainable place to build a city. That is the *best* case because it *might* spare them from the cascade of cities to fail afterward when it turns out the problem is simply overexploitation of limited resources on a national, if not global, scale (ie, wherever people evacuate to collapses next, and then the next place, until the entire population of Iran are refugees). Sadly, I don't see any reason to think this is the case. It's been a settlement for roughly six thousand years. It has become unsustainable only very recently in a historical context. That could be attributed to incompetent resource management, over-reliance on imports, or exhaustion of both. This does not bode well for other highly populated cities in the region. Iran is a world power. They destabilize neighboring regimes. They are a thorn in the side of what is called the world's last superpower. Their capital imploded, and the whole country could follow.