For Nigel Portman, a love of travelling began with what's called a "gap year". In common with many other British teenagers, he chose (take) a year out before settling down to study for his degree. After doing various (job) to raise some money, he left home to gain some experience of life in different cultures, visiting America and Asia. The more adventurous the young person, the (great) the challenge they are likely to set (them) for the gap year, and for some, like Nigel, it can result in a thirst for adventure.
Now that his university course (come) to an end, Nigel is just about to leave on a three-year trip that will take him right around the world, What's more, he plans to make the whole journey (use) only means of transport which are powered by natural energy. In other words, he'll be relying (main) on bicycles and his own legs; and when there's an ocean to cross, he won't be taking a shortcut ( 捷 径 ) flying aboard — he'll be joining the crew of a sailing ship, instead.
As well as doing some mountain climbing along way, Nigel hopes to pass on to the people he meets the environmental message lies behind the whole idea.