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We all have to be concerned about the world being very dangerous.

If one is forever cautious, can one remain a human being?

We are living in a world of fear. The life of man today is corroded and made bitter by fear: fear of the future, fear of the hydrogen bomb, fear of ideologies. Perhaps this fear is a greater danger than the danger itself because it is fear, which drives men to act thoughtlessly, to act dangerously.

We are in grave danger of losing forever not just millions of years of evolution on earth, but the eons of change that have produced man and his natural environment.

We can fear things into existence. Fear looks into the future and imagines the worst that can happen.

In time, we will have to recognise that it is not 'nature' that we need to protect, but ourselves, and we can only do this by abandoning the old, grandiose, profit-seeking schemes so beloved of our masters and learning to till the soil, live to scale, and live within our means.

There are risks which are not acceptable: the destruction of humanity is one of them.

We have become frighteningly effective at altering nature.

The most dangerous creation of any society is the man who has nothing to lose.

Till now man has been up against Nature; from now on he will be up against his own nature.