The vast majority of today's transport depends on fuel that comes from oil. Hundreds of thousands of items we use every day - from trainers to medicines - come from or use products that come from oil. But where does oil come from - and what happens when this ancient resource runs out?

The vast majority of today's transport depends on fuel that comes from oil. Hundreds of thousands of items we use every day - from trainers to medicines - come from or use products that come from oil. But where does oil come from - and what happens when this ancient resource runs out?