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As scientists discover more about the vastness of the universe and the evolution of our own solar system it becomes more amazing that our tiny planet is so supportive of life. Through a long and precarious history our atmosphere has developed and stabilised. We are just the right distance and orbit around the sun and the long process of evolution has favoured us. We have therefore survived and multiplied so that the human population reached one billion in the 1830’s. Since then the number of people has grown substantial and in just 13 years from 2011 to 2024 it is estimated that the number will rise from 7 to 8 billion.

This means that the world population is estimated to dramatically increase during the lifetime of many of today’s children. This represents serious challenges for food supplies, health care,  energy generation,  environmental balance and social cohesion.