Today there is consensus that human activities like burning Of fossil fuels and consequent pumprng Of gases like carbon dioxide into atmosphere have been responsible for the earth getting hotter and hotter. Today, there are threats to our planet arislng from climate change, degrading environment, the growlng rate of extinction of species, declining availability of fresh water, rivers running dry before they can reach sea, loss of fertile land due to degradation, depleting energy sources, incidence Of diseases, Challenge Of feeding an exponentially growing population, and so on.