Subject: How are very high temperatures generated.

I have been reaserching nuclear fusion in particular and the possiblities this 
will create in terms of producing hydrogen which can be used in place of 
fossil fuels.  I have found a lot of very detailed and confusing explainations 
of this process and i was wondering if you could explain it in simple terms.  
Are there any other ways of generating very high temperatures or any other 
uses for high temperatures.  

thank you very much for your time and help

Alison

Re: How are very high temperatures generated.