I like challenges in life and pushing myself out of my comfort zone.

Our generation has inherited an incredibly beautiful world from our parents and they from their parents. It is in our hands whether our children and their children inherit the same world. We must not be the generation responsible for irreversibly damaging the environment.

So unlike having to convert, you know, all the cars' or all the lorries' petrol stations, once you've actually got the clean fuels, it's relatively easy to, you know, get it to the airplanes.

I had no plans to be an entrepreneur. I just wanted to be a journalist and write for a magazine. At 15, I just decided to leave school and launch a national student magazine.

Rather than getting nostalgic...embrace the new opportunities and challenges available to you now.

THERE'S NO OTHER WAY to find out whether or not you'll be successful other than just doing it

I've been lucky to have survived balloon trips, boating trips, you know, a lot of rather foolish things in my life, so I was definitely born under a lucky star.