system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Would Sokovia really destroy Earth if it'd hit the ground?
gpt
There'd still be an Earth. Humans just couldn't live on it. 

The impact would be akin to one of the extinction-tier meteor hits that happened during the ages of the dinosaurs. The area around the immediate impact would be destroyed, and everywhere else would be under a cloud of dust and debris so thick that the biosphere would collapse from lack of sunlight.

In the following year, the human race would run through it's food stores, which are now functionally irreplaceable. Crops can no longer be grown in sufficient quantities. Plants and grasses die off, killing the herbivores and then the carnivores in turn. Many will starve to death. Many will die in conflict over the remaining food on scales ranging from individuals stabbing each other over the last contents of the local grocery store to full-scale war as nations prioritize their citizens over the rest of the world.

In places with advanced technology, small groups of humans may be able to sustain themselves. The power requirements to grow food for an entire settlement without the sun are massive, and few are equipped to make the need. The Wakandans and small pockets of Americans equipped with arc reactors, and so on. Meanwhile, the surviving members of the magic community find themselves as a nucleus for survivors and refugees, using dimensional travel to access realms where crops can grow... or where refugees can leave permanently. 

But Ultron isn't done with them. Any pockets of human survivors are going to come under assault. The tech-based survivors get it first, half because they'd be easier to detect, and half because of his hatred for Tony; anyone living on the energy from an arc reactor has got a target on their back.

Wakanda holds out longer, both as a nation and as individuals, but Ultron's dominion over the world gives it a massive resource advantage. Eventually the raw numbers game of siege warfare will work out in the machine's favor, with the Wakandans either engaging in a crash interplanetary evacuation (which is only buying time) or making a deal with the magicians for evacuation. Either way, the final human civilization on Earth falls.

The last ones out the door are the magicians. They stay as long as they can, getting out as many as they can, and more than a few die holding the line to get a few more out before the portals close. 

Humanity lives on, but the Earth belongs to metal.