Why don't we stop using fossil fuels and start using hemp gasoline? Don't you think it would help?

i have no idea why we are still using fossil fuels its already proven that our car exhaust is deteriorating our atmosphere and we do Absolutely nothing about it. PEOPLE THE 1ST CAR EVER MADE DID NOT EVEN RUN ON WHAT WE ARE USING TODAY. the T-1 model ran on hemp gasoline. HEMP. not ozone killing fossil fuel