System Upgrade: Doomsday Survival Master

[System activation! Get a 90-day doomsday warning! When this message appeared in front of Lin Han, there were still three full months before the global climate disaster! While others are still worrying about housing and car loans, he has already started frantically stocking up on supplies and renovating his base! Extremely cold -80℃? His refuge is as warm as spring! Acid rain corrosion? His equipment is indestructible! Mutated creatures are coming? His weapons have evolved to doomsday level! From abandoned air raid shelters to mobile fortresses, from individual combat to global alliances, see how urban planners take advantage of the system to build the dawn of human civilization in the apocalypse! "Three months is enough for me to transform hell into heaven!"