Is really everything so sad? If to speak about the Earth as a whole - here, I think, it will adjust pollution by itself: oil and coal will end much earlier, than the atmosphere will finally become soiled, the bacteria come instead of felled forests absorbing carbonic gas … in addition at modern rates of development of new technologies I won't be surprised, if in the near future alternative energy sources will be found.As to sweet… it is better to eat everything you ant and to live 65 years,than 70 years to dream of a piece of a pie or fat meat. You won't need any diet if you indulge in sport!