To have success in your professional life is not so hard. To succeed as a man is more difficult.

For me, an aerial picture is no different than a close-up portrait. It's a question of framing and angle. Helicopters are great for that. But I've also used planes. Of course, I always have a harness.

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.

Our children think our world will end. It's a tragic thing. Adults don't think that. They don't see that we are eating the planet. But we are. If you take all the biomass of vertebrates on the planet, 98% are men and their domestic animals. All the wild animals in the world make up only 2%.

The fact is that seven per cent of the global population emits 50 per cent of greenhouse gas emissions, and the proportions are the same for the use of energy and raw materials, meat, wood, etc. Simply put, an infinitesimal minority consumes the most and imposes damage on the overwhelming majority, while asking it to change.

The Rio Earth Summit in 1992 changed my life completely, turning me into an activist. From the air, you see things you can't see from the ground - you really understand the impact of man, even in a place you know well. My work is meant to convince people we can no longer live like this.