If we are to exercise our responsibilities so that all life can continue on earth, they must have a moral and philosophical basis. Simple self-interest, economic profit and absolute materialism are no longer enough... It has been made perfectly clear that a concern for any part of life on this planet — human, plant or animal, wild or tame — is a concern for all life. A threat to any part of the environment is a threat to the whole environment, but we must have a basis of assessment of these threats, not so that we can establish a priority of fears, but so that we can make a positive contribution to improvement and ultimate survival.

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For conservation to be successful it is necessary to take into consideration that it is a characteristic of man that he can only be relied upon to do anything consistently which is in his own interest. He may have occasional fits of conscience and moral rectitude but otherwise his actions are governed by self-interest. It follows then that whatever the moral reasons for conservation it will only be achieved by the inducement of profit or pleasure.

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I sympathise desperately with the people who are bereaved at Dunblane, but I'm not altogether convinced that it's the best system to somehow shift the blame onto a very large and peaceable part of the community. I mean if ... look, if somebody ... if a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat which he could do very easily, I mean are you going to ban cricket bats? I'm not sure that the reaction is the most rational. I think one's got to make a difference between what the weapons can do and what the people can do.

As its name implies, World Wildlife Fund is in the business of raising money for the conservation of nature and to that end Fleur Cowles — a long time and dedicated supporter of the Fund — has offered a proportion of the royalities from the sale of this book to WWF.
It is easy enough to feel an affinity to a particular species of animal, but I just wonder what it would be like to be reincarnated in an animal whose species had been so reduced in numbers that it was in danger of extinction. What would be its feelings towards the human species whose population explosion had denied it somewhere to exist and by sheer indifference had destroyed any chance of it finding a mate and producing a family? There are not just a few such species, there are a great many and the list is getting longer every day. When I look at the shelf with all the volumes of the Red Data Books listing endangered species I must confess that I am tempted to ask for reincarnation as a particularly deadly virus, but that is perhaps going too far. I would much rather see the human species voluntarily restrict its numbers out of consideration for the rest of the living world with which it still has a chance of sharing this planet.

I don't claim to have any special interest in natural history, but as a boy I was made aware of the annual fluctuations in the number of game animals and the need to adjust the "cull" to the size of the surplus population.
It took about three and a half billion years for life on earth to reach the state of complexity and diversity that our ancestors knew as recently as 200 years ago. It has only taken industrial and scientific man those 200 years to put at risk the whole of the world's natural system. It has been estimated that by the year 2000, some 300,000 species of plants and animals will have become extinct, and that the natural economy, upon which all life depends, will have been seriously disrupted.
The paradox is that this will have been achieved with the best possible intentions. The human population must be properly fed, human life must be preserved and human existence must be made safer and more comfortable. All these things are obviously highly desirable, but if their achievement means putting the survival of future generations at risk, then there is a pressing obligation on present generations to apply some measure of self-restraint.
What has been described as the «balance of nature» is simply nature's system of self-limitation. Fertility and breeding success create the surpluses after allowing for the replacement of the losses. Predation, climatic variation, disease, starvation--and in the case of the inappropriately named Homo sapiens, wars and terrorism--are the principal means by which population numbers are kept under some sort of control.
Viewed dispassionately, it must be obvious that the world's human population has grown to such a size that it is threatening its own habitat; and it has already succeeded in causing the extinction of large numbers of wild plant and animal species. Some have simply been killed off. Others have quietly disappeared, as their habitats have been taken over or disturbed by human activities.

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Q: What do you consider the leading threat to the environment?
A: Human population growth is probably the single most serious long-term threat to survival. We're in for a major disaster if it isn't curbed--not just for the natural world, but for the human world. The more people there are, the more resources they'll consume, the more pollution they'll create, the more fighting they will do. We have no option. If it isn't controlled voluntarily, it will be controlled involuntarily by an increase in disease, starvation and war.
Q: Is birth control part of the solution?
A: Yes, but you can't legislate these problems away. You've got to get people to understand the need for it: the more important people, the ones who have responsibilities have got to do it because they're at the receiving end. They've got to accept the measures.