The complete conversion of deuterium nuclear fuel releases an energy content of 250 x 1015 joules per metric ton of deuterium. The quantity of deuterium in the world’s oceans is estimated at 4.6 x 10^13 metric tons. Deuterium present in seawater will yield around 5 x 1011 TW-year of energy. In the year 2011 the entire planet consumed around 16 TW-years of energy, which means that the energy content of the deuterium in seawater would be enough for 31 billion years of energy supply.
To give all 10 billion people expected to live on the planet in 2050 the level of energy prosperity we in the developed world are used to, a continuous average use of power of 6 kilowatts per person as is typical in Europe, we would need to generate 60 terawatts as a planet—the equivalent of 900 million barrels of oil per day.
In view of the enormous amount of deuterium available, it is important that we learn to use the D-D fusion reaction in the long term, and Thorium Ignited PACER Fusion is the most practical form of fusion today that is capable of economically supplying large Gigawatt levels of power safely without requiring decades of additional development.
The time since the earth first formed = 4.54 billion years.
The time until the sun burns out = 5 billion years.
The deuterium in the sea is capable of completely powering planet earth at a level of 60 Terawatts for 8.33 billion years (longer than the earth has existed or the sun will burn)
This type of fusion is by far not enough. Sun becomes hotter, we have to move Earth in a higher orbit. Otherwise live would end in the next some hundred million years. A ion drive to change the Earth orbit by 6 m per year (6 million km in the next billion year) requires 2400 TW. 40 times more than just to run the civilization. The 2400 TW can be produced by 20 million km² in space.
Roland Mösl, http://calculation-error.org (04/04/2013 07:52:20)
Roland - Some Suggestion covering at least some of your concerns offered by Dr. Friedwardt Winterberg For the human species and its unique culture to survive the death of the sun, a bridge must be built to other solar systems with earthlike planets. The Kepler space telescope has discovered a large number of extrasolar planets, but only a few with earthlike conditions, and those are many light years away. Assuming that no new fundamental laws of physics are awaiting discovery that would greatly facilitate interstellar spaceflight, I can only see two avenues to reach them: First, at 10% of the speed of light via deuterium fusion bomb propulsion, harvesting the deuterium in the comets of the Oort clouds surrounding our and other suns, and by hopping from comet to comet. Second, at relativistic velocities by matter-anti matter generated GeV laser beams released from relativistically stabilized hydrogen- antihydrogen super-pinch discharges, transmitting the recoil of the laser beam by the Moessbauer effect to the spacecraft. The production of the anti-hydrogen can be done with solar energy in robotic factories on the planet Mercury. For the first, but much more for the second possibility, very large masses must be lifted in one stage into low Earth orbit, which can be done by chemically ignited pulsed pure fusion bomb propulsion.
robertsteinhaus, www.yottawatts.net (09/07/2013 02:00:31)