The planet was governed by only one federal government and a few giant companies. It was a democrat country, with a president. However, the president was always busying in fighting against those companies, and eventually reaching a relatively equilibrium state. 55 years ago: News reported that the sea level unnaturally rose for over five meters within only a few years. Scientists tried hard to figure out why was this happening, but in the end, they could not came up with a conclusion. Cities distributed near the coastline were submerged by the raging sea water, and millions of people lost their homes. The government concluded that the unexpected change of the ocean was caused by global warming, and they imposed a strict environmental tax on the giant companies, which led to another furious fight between the government and the companies. 50 years ago: Scientists discovered that the temperature on Earth was actually decreasing. Extreme weathers including low temperature and snowstorms were frequently recorded on high latitude areas including Russia, North America, and North Europe. This made the global warming theory fell into the ground without being attacked, and the government had to pay a fee to the mega corps. 42 years ago: As the average temperature continued to decrease, food storage around the world was depleted. Flame raged across the globe, killing millions of people. 40 years ago: The government as well as the mega corps failed as the global average temperature fell behind 0 degree. Temperature continued to fall and people began to compete for resources. Small communities formed in warmer places, such as forests around the equator or the middle of mountains. 30 years ago: The temperature around the equator fell behind -10 degree, and the communities collapsed as the cumulated resources around the equator was used up. Refugees escaped from the equator and travelled to different places for food and accomodation. however, few places decided to accept those environmental refugees, conflicts continued to take place around the globe. 15 years ago: Snowstorms suddenly raged around the world so that it was dangerous for people to forge or collect necessities outside their accomodation. Communities were were separated from each other and they chose not to trade or communicate except for some important materials (e.g. oil). 10 years ago: the village where our characters lived in was formed by a group of refugees in a unexpected valley. They managed to utilize the coal and the forest discovered in the place and they could get access to food and accomondation.