Hows this for an idea... (My simple guess, big rock vs Yellowstone. For a longer read, see below.)
All attempts to stop an impending asteroid fail, now the people of earth can only sit and wait for the impact, if they are told at all.
The 1000 km wide asteroid impacts directly into Yellowstone, causing a super mega eruption, upon a level not yet thought of. The impact sends a massive shockwave through the earth's magma to the other side of the world, causing volcanos to erupt there as well.
Between the heat of the impact and the multitude of now very active volcanos, the average surface temperature hovers somewhere around 135 degrees fahrenheit day and night, for weeks on end. The volcanos continue erupting for longer than that, though. Spewing their ash, sulfer, and carbon dioxide high up into the atmosphere.
The initial heat wouldn't hurt too much if you were far from the impact zone, but heat would be the least of the problems, because now it would be raining.
The volcanic clouds forever looming would not bring reprieve from the heat drawn thirst, but instead the impending doom of caustic sulfuric rain. The rain that had once brought life would distroy it.
Any living thing left out in this rain would be sure to wither away. Birds mid flight would drop like rocks from the sky, as the rain burned off their feathers. Some trees would combust in flame from the heat and from the acidity of the rain. That same rain would pollute the soils for years, that we know, so much that no current seed would grow.
As the vocanic ash and the remaining asteroid debris orbit the earth, the debilitating heat they once held would fade away. So too would the heat from the sun be blocked. For years, too many to be counted, the earth would be shroud and covered in a seemingly endless grey. Getting colder every day.
Until upon a time, that only near the equator would be warm.
At the end of The Road, welcome to the new ice age. Ever, will the Earth grow again..
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