What would Happen if, A) All Fossil Fuels were to run out B) Just Oil C) Just Coal D) just gas C) anything else u can think off I think B) Petrol Prices rising to like $10 per litre, People not buying petrol, Petrol Companies going backrupt, People with shares in compainies going backrupt, People unable to sell their useless cars. Airline services going bankrupt, and unable to sell their Jets, Etc for every form of transport. Forcing people to buy Electric Transport in first few years, then most governments econmy going down the drain, unless putting a higher-charge on the electricity for cars. War against countries which still posess small oil deposits. Loss of most means of trade, everything rising in price, due to cost of Petrol (if they dont stop paying alltogether). People buying electric cars / other means of transportation will increase the money/trade again but still the money from petrol wont be there, leading to nearly Inivitable "world depression". Especially with the crash of the giant Oil compainies and loss of all shares/stock.