...the chief cause for the impending collapse of the world - the cause sufficient in and by itself - is the enormous growth of the human population: the human flood. The worst enemy of life is too much life: the excess of human life.

If there were a button I could press, I would sacrifice myself without hesitating, if it meant millions of people would die.

The 20th century peatlands ditching in Finland was the worst human environmental destruction action in Europe.

How can anyone think so insanely that the human life has the same value and mankind, the same morality, independent of numbers? It is lucid to me that everytime a new child is born, the value of every human in world decreases slightly. It is obvious to me that the morality of the population explosion is wholly unlike than when man was a sparse, noble species in its beginning.

What to do, when a ship carrying a hundred passengers suddenly capsizes and there is only one lifeboat? When the lifeboat is full, those who hate life will try to load it with more people and sink the lot. Those who love and respect life will take the ship's axe and sever the extra hands that cling to the sides.

Everything we have developed over the last 100 years should be destroyed.

I could never find two people who are perfectly equal: one will always be more valuable than the other. And many people, as a matter of fact, simply have no value.