Can Nuclear Fusion Power Ever Reach Break-Even Point?

[Tarbel]

Why isn't it breaking even? Is it just too much energy is needed to cause it? Or it needs to be a continuous reaction? Why can't we just heat up multiple hydrogen atoms enough to cause multiple fusion reactions?
And is it possible to use a molecule, say carbon dioxide, and induce fusion?
And hi to everyone XD

 

[PAllen]

Why not start with:

http://en.wikipedia.org/wiki/Fusion_power

and:

http://w3.pppl.gov/~hammett/talks/2005/kitp-fusion-status.pdf