Yann Arthus-Bertrand

For nearly two years, I was flying above the planet with my camera. I knew straight away that this was something important to do, just at this moment, a portrait of the planet for the millennium year. I worked in 80 countries, fighting for money all the time.

I learned to be a hot-air balloon pilot to take tourists over the Masai Mara Reserve in order to earn some money and finance the work I was doing with my wife, Anne. We were studying the life of a family of lions for more than two years. Taking pictures was a way to capture information we could not put in words.

Of course, everybody makes mistakes, and we've all been young and stupid. But people need to have a sense of respect, particularly in this business, because hundreds of people are ready to take your place at any time. Maybe some people should think about that.