user: Make up a new global threat on the level of global warming.

assistant: A made up threat with large scale effects on the world could be as follows:
A rogue planet passing through our solar system has caused earth to slowly spiral away from the sun.

To explain why this is on the same level as global warming, consider the following:
 - The slow movement away from the sun will gradually cause the world to cool down, as the sun's rays grow weaker. This cooling effect will drastically affect global food production, and eventually cause crop failures as the climate rapidly drifts from normal. This will, expectedly, cause massive human suffering in various forms such as famines, social unrest and falling goods supplies.
 - This threat mirrors global warming in its predictability before the turning point: A rogue planet approaching earth would have been noticed years or even decades in advance, allowing the possibility for plans to be enacted to avoid pr otherwise defuse the threat.
 - The threat will not equally impact all of the world, like global warming: Food shortages will affect countries which import it more that exporters. Weakening sunlight will cause regions dependent on solar to suffer energy shortages, while other regions which use non-solar energy will be able to avoid the shortage. Goods like cotton, bioplastics, and other plant based substances are usually very regional in their production, and this will affect trade and the well being of those farming the resource.

user: Can you provide a brief summary of a story about the discovery of this looming danger and humanity's desperate attempts to stop it?

assistant: The rogue planet was discovered already in 2074, but due to the vast distance and that a rogue planet had not previously passed within the solar system it took more than 3 years before the discovery was verified by a dedicated science mission. The closest encounter was calculated to happen in 2089, and the planet would be the 3rd brightest object on the sky after the sun and the moon during that period. 
The original astronomers had already in 2075 warned that their calculations showed that the rogue planet could disrupt the motion of the planets, although due to the chaotic nature of orbital mechanics and the uncertainties involved it was not possible to exactly predict what would be the long term consequence. However, they did call for urgent action to prepare for all eventualities. The movement to prepare humanity for the potential catastrophe was a growing movement calling for spending over 5% of the global GDP on research on how to mitigate the effect. Politicians were however skeptical on spending this amount, and some populist parties around the world seized upon some research that showed that there was a 30% chance of the rogue planet causing no major disruptions to the planet. Despite the growing evidence over the year as the planet approached that it would lead to a significant change in Earth orbit, the initial 30% estimate lived on as a a myth in large parts of the public, effectively blocking some critical actions to be taken early. Initially there were hundreds of ideas on how to solve the problem, including kick starting global warming again, trying to divert the planet by the use of the entire world's arsenal of nuclear weapons and other and colonizing other planets to provide a backup for humanity. However, most of the ideas were impractical, and often pushed by people with special interests. 

As the consequences of the cooling climate became to large to ignore, an international collaboration to build an enormous mirror to reflect more light onto the planet became the prevailing idea. But despite the consensus on the building of the mirror, the project faced many obstacles due to disagreements on who should get to build the mirrors, where the sunlight should be pointed etc. Humanity eventually succeeded in stabilizing the cooling, but many of the negative consequences had already happened causing much loss and suffering.