How much oil is left? http://en.wikipedia.org/wiki/Oil_reserves#Estimated_reserves_by_country http://en.wikipedia.org/wiki/Oil_reserves#Estimated_reserves...

How much oil is left? http://en.wikipedia.org/wiki/Oil_reserves#Estimated_reserves_by_country http://en.wikipedia.org/wiki/Oil_reserves#Estimated_reserves... How about natural gas? http://en.wikipedia.org/wiki/Gas_reserves http://en.wikipedia.org/wiki/Gas_reserves If all gasoline engines are replaced by natural gas engines, we would have fuel for a hundred years more.