Per 
Humanity finally decided they were better off without us. Only, they'd killed the planet beforehand.
That's the actual reason why they wanted us gone. Of course, the changes were gradual; A few spots of global warming here, a bit of a new anti-heat formula exposed to the atmosphere there. They'd massively underestimated their new creation to fight global warming. When the effects finally settled. Countries began to freeze at temperatures below 0 degrees Kelvin. And then other countries not exposed to the formula saw their plants and animals boil in the new wave of banished heat. There was a small section between these extremes that people built cities. They had skyscrapers able to reach the clouds, underground societies that survived all the way down to the outer core. Those in the extremes were still able to survive. Some took to vehicles able to resist the conditions, switching between the two as they are passed through. Others took to bunkers, hiding with artificial plants for food and artificial lighting for health.
The formulas they used were developed by the GOC PTOLEMY division with equipment from the Foundation, and ordered that the formula was to be used in very small doses, but the second note never made it to the UN headquarters when the formula was to be dispersed. They overused the formula, plunging the state of New York into an eternal winter over the course of four months. The UN disbanded the GOC division entirely, and discovered relations with MTF Sigma-3, as well as operatives from MTF Iota-10, leading to the attempted shut down of the foundation. We were forced to hide underground, or latch onto the vehicles that were able to move between the extremes so that we could attempt to move the UN away from our main containment site. Luckily, most Sites and Areas were well enough equipped to survive harsh conditions, but some sites needed to be evacuated and the SCPs relocated. Site-01 was attacked by the UN in the final days of humanity, resulting in the death of 7 O5 personnel and a majority of RAISA and MTF personnel. But we persevered, evacuating the remaining 6 O5s and deactivating anything that would give away our positions. Including the SCiPNET and the SCUTTLE systems.
Not everyone was as fortunate as us. The Insurgency returned to the foundation, with the SPC not far behind them before our doors froze. The churches, cults and initiatives settled their differences between themselves and ran to their securest outpost, the MEHKANE factory of the Broken God worshippers. Wondertainment, MC&D and Anderson utilised their ties to the serpents and ran to the library, with three portlands being sealed under layers of ice. All that remains of those who either wouldn't or couldn't hide now is the remnants of the society they were once in. The anomalous world is in peace now, with its protection resting in the three groups: The Foundation of Science, The Library of Magic and The Churches of Believers. The relations between us and the others is unstable, but it isn't enough to risk war between ourselves. We are all just people, anomalous or not, trying to survive in the mistakes of society.
