The words from the Adlai Stevenson's excellent speech to the UN [1] in which he said: "We travel together, passengers on a little space ship, dependent on its vulnerable reserves of air and soil; all committed for our safety to its security and peace; preserved from annihilation only by the care, the work, and, I will say, the love we give our fragile craft. We cannot maintain it half fortunate, half miserable, half confident, half despairing, half slave-to the ancient enemies of man-half free in a liberation of resources undreamed of until this day. No craft, no crew can travel safely with such vast contradictions. On their resolution depends the survival of us all." could not be more true than in this moment when the World is facing many critical political, economic and social problems. Population growth and increasing consumption connected with strong economic inequality (25% of the population of the world consumes 75% of its natural resources [2]) put pressures on limited natural resources: water, forests, fish stocks, minerals, land for food production and living space, etc. Questions of environment and energy are now top on our priority list.