Every one of us can make a contribution. And quite often we are looking for the big things and forget that, wherever we are, we can make a contribution. Sometimes I tell myself, I may only be planting a tree here, but just imagine what's happening if there are billions of people out there doing something. Just imagine the power of what we can do.

I'm sure the government of Qatar is not coming in to grow food for the people of Kenya; it's coming to grow food to sell. If it can also sell to the people of Kenya, well, then good. I think that the moves can be helpful, but I think that the history that Africa knows, as I say in my book, has been a history of exploitation.

But when you have bad governance, of course, these resources are destroyed: The forests are deforested, there is illegal logging, there is soil erosion. I got pulled deeper and deeper and saw how these issues become linked to governance, to corruption, to dictatorship.

Because I was a woman, I was vulnerable. It was easy to vilify me and project me as a woman who was not following the tradition of a 'good African woman.'

There are opportunities even in the most difficult moments.

We see that the environment is something to exploit, because we see the environment in terms of minerals for example, or forests, or even raw materials that we produce on our land, or even land itself. We see it in terms of what we can exploit rather than the medium in which all of these activities have to take place.

We can work together for a better world with men and women of goodwill, those who radiate the intrinsic goodness of humankind. To do so effectively, the world needs a global ethic with values which give meaning to life experiences and, more than religious institutions and dogmas, sustain the non-material dimension of humanity. Mankind's universal values of love, compassion, solidarity, caring and tolerance should form the basis for this global ethic which should permeate culture, politics, trade, religion and philosophy. It should also permeate the extended family of the United Nations.