Our interconnectedness on the planet is the dominating truth of the 21st century. One stark result is that the world's poor live, and especially die, with the awareness that the United States is doing little to mobilise the weapons of mass salvation that could offer them survival, dignity and eventually the escape from poverty.

The time has come to end this charade. The debts are unaffordable. If they won't cancel the debts I would suggest obstruction; you do it yourselves. Africa should say: 'thank you very much but we need this money to meet the needs of children who are dying right now so we will put the debt servicing payments into urgent social investment in health, education, drinking water, control of AIDS and other needs.'

We had a booming stock market in 1929 and then went into the world's greatest depression. We have a booming stock market in 1999. Will the bubble somehow burst, and then we enter depression? Well, some things are not different.

The defining challenge of the 21st century will be to face the reality that humanity shares a common fate on a crowded planet.

All of the incessant debate about development assistance, and whether the rich are doing enough to help the poor, actually concerns less than 1% of rich world income. The effort required of the rich is indeed so slight that to do less is to announce brazenly to a large part of the world: 'You count for nothing.' We should not be surprised, then, if in later years the rich reap the whirlwind of that heartless response.

In my view, there is an urgent need to communicate with the public and help to explain where there is consensus, and where are there doubts about the issues of sustainable development.

Soil mapping is one of the pillars to the challenge of sustainable development