Sex, not religious or cultural beliefs or the quest for economic security, is what increases family size and drives world population growth. The more people that live and survive, the more the population will grow. Medicine, foods, health habits allow our human population to grow. Yet we are the one who make this world small and get worst. The effects of it in the individual and environment have a great impact. For the individual, the nutrition of everybody is in risk mostly to the marginal country who feel scarcity specially the basic needs. And when it comes in our environment we constantly destroy the things that are natural and change it and develop with an artificial one. The basic cause of global climate change is too many people consuming too much carbon-based energy. The combination of individual impacts times the number of individuals is overwhelming the equilibrium of the Earth's systems. This lead to the destruction of our home just a single cause of two individual making an intercourse producing offspring that can’t look after the needs of their child or children and being an irresponsible youth making some undesirable things that can harm our environment.