Decarbonization

Humans have exploited earth resources too much and are at the verge of extinction. The last chance to survive is to immediately change to renewable energy. Otherwise, increasing climate change will eradicate the human race. 

The game starts with a fully functional base which only uses fossil fuels and other non-green industry. With each passing day, we produce more and more greenhouse gas and speed up climate change. The goal is to completely change from fossil fuels to renewable energy before a climate catastrophe (probably melting glaciers, indicated by rising sea levels) eradicates humankind.