Can you tell the difference between them? - Prince Philip, Duke of Edinburgh

I suspect that the single most important gift of progress to conservation has been the development of human contraception techniques.

Education, journalism, technology, entertainment and business may also find better methods for their purpose than books and writing. But this does not mean that tapes and films have made books obsolescent—the contention is almost too ludicrous to be taken seriously. Books are certainly old fashioned, but only people with a very limited perception are silly enough to condemn ideas because of their age. It is, of course, equally silly to condemn the new fangled simply because it is strange, and I am full of admiration for the technologists who have developed all sorts of gadgets for the purpose of improving communications. However, I believe that all these fascinating machines are complementary to, and not substitutes for, books and the printed word.

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.