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If fusion could provide earth with clean energy for thousands of generations why don't we start using it now?

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The problem is that, although there are a range of different techniques for fusion, most of them produce less energy than is required to sustain the reaction. The most promising systems are "hot" reactors. The reaction takes place under conditions of very high temperature and pressure and it is difficult to safely contain such reactions. There are plans to build a prototype reactor that will produce a net energy output for "many minutes" but, alas, we are several years (possibly many years) from commercial fusion power stations.
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When a fusion reactor for safely generating energy is developed the element that could meet Earths energy demands for millions of years is?

  The most likely fusion reaction to be exploited for power production is between deuterium and tritium, both isotopes of hydrogen. Deuterium oxide is heavy water and can

How is nuclear fusion used now?

We have currently only put nuclear fusion into two rather destructive purposes. The first of course being Atomic Nuclear weapons, which utilize unbalanced atoms to force mass

What provides most of the energy used by life on earth?

As far as I know the sun provides ALL of the energy used by life on earth. Except maybe nuclear by humans, but photosynthesis in plants and that is the same energy stored in s

Fusion energy can be harnessed on earth?

So far only in bombs.

Why don't people use renewable energy now?

They do, but if you are asking why it is not done on a larger scale, it has to do with money. For the current energy companies to switch over to a new technology cost money up

Why don't we use nuclear fusion?

At this time nuclear fusion is only practical in bombs and stars. Since the early 1950s various experimental apparatus have been tried to determine how to build a fusion react