Did you know that...
...the chemical reaction that makes the sun to glow means that the pulp of the sun reduces with about 4 million tons per second? Within this only second more energy is used than mankind has  expended since civilisation began. This constant nuclear reaction has it beginning somewhere near the nucleus of white heat, where the temperature is about  23400032 F° (13 million C°)

One can say that the sun is a gigantic hydrogen bomb that detonates very slowly. But it is only its enormous proportions that makes it send out that much energy. Its energy beams is not more than a fifth compare to the human body´s mass volume. The sun is however so huge that it, despite the great loss of mass, that it will continue to shine  for at least 8 billion years. Thereafter the sun, witch is classified as a yellow midget, will be transformed to a red gigant. When it happens, enormous heat will be free and all life on Earth will be wiped out.
If our surviving relatives have found a way to protect themselves to this, more problems are waiting, the terrible cold will spread all over our planet.