Why do you need alternative fuels?

Driving cars that use petrol & diesel has a significant impact on the environment. The every day use of cars across the UK produces a massive amount of carbon dioxide which is a greenhouse gas and a recognised cause of global warming.
Not only does using petrol & diesel have a major impact on the environment, but oil supplies won't last forever. Some estimates are that existing oil supplies may run out in the next 50 years! Certainly, the amount of oil available is limited as it takes millions of years to be produced in nature. As a result, it's important to look at alternative sustainable fuels in order to protect our future.