I'm not an expert when it comes to technology, but what changed things for me was autofocus. I used to have to throw away half my pictures because it was so difficult to get the focus right.

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.

I wanted to be a scientist. I did a thesis on lions. But I realised photography can show things writing can't. Lions were my professor of photography.

The key of 'The Earth from Above,' and of 'Home' is to show the beauty of the planet, and thereby to promote love for it.

No one is an environmentalist by birth. It is only your path, your life, your travels that awaken you.

The whole world is determined by trade - which is really the blood of the world. The driving force is everyone's desire to have a better life. How? By consuming. For countries, the "Holy Grail" is economic growth.

Will we be able to imagine a new culture of water?