But the threat to our world comes not only from tyrants and their tanks. It can be more insidious though less visible. The danger of global warming is as yet unseen, but real enough for us to make changes and sacrifices, so that we do not live at the expense of future generations.
No-one should under-estimate the imagination that will be required, nor the scientific effort, nor the unprecedented co-operation we shall have to show. We shall need statesmanship of a rare order.
The real dangers arise because climate change is combined with other problems of our age: for instance the population explosion;
— the deterioration of soil fertility;
— increasing pollution of the sea;
— intensive use of fossil fuel;
— and destruction of the world's forests, particularly those in the tropics.