What percent of cars in the world use alternative fuel sources?

Question

I'm doing an assembly on global warming and oil peaking at my high school, and I can't find this particular statistic. Anyone know?

Answer 1

Not a fact, but less than 5% is my guess.

Answer 2

Mine is wvo.

Answer 3

I burn a mixture of 10% ethanol and 90% gasoline.  This is what comes out of the pump at all the gas stations in my area, so pretty much everyone does.

Answer 4

0.000000000000000001 %