by bobcousins » Thu 15 Dec 2005, 07:03:48
$this->bbcode_second_pass_quote('orz', 'T')here are no limits to our growth given a large and long-lived enough energy source.
And pigs could fly given a large enough source of lift. This line of reasoning is absurd. It is just begging the question. "Enough" is a trick word, it is a way of hiding the premise in the conclusion.
No energy source will be infinite, certainly not fusion. A fusion reactor takes space, time and resources. If any of these are non-zero, there is a limit. The best you could say is that it produces abundant energy (we don't know yet), but it is certainly not infinite. Equally, transmutation of elements has a cost, and may be possible but will also be limited.
Scientists may discover a way to extract energy from the quantum vacuum (ZPE). But this will certainly be expensive to produce in scale.
The problem is that you can increase the amount of energy obtained, at the expense of capital cost. The energy/cost ratio will never be zero. There is a point where a diminishing return is reached. It does not matter how much the energy source produces, if it requires more resources than we have available.
We have lived in a time where increased technology has produced increased benefits, almost in a linear fashion. But there is no theoretical reason which says that linear progression will continue. On the contrary, there is plenty of evidence that it won't.
History shows that civilisations that relentlessly pursue the factor that made them great end up collapsing. Technology is like the Roman army, pyramids or Moai - what makes a culture great can also be its downfall if pursued beyond the limit of diminishing return.
If and when we find an "infinite" energy source, then we can contemplate infinite growth. Until then, we must live sustainably with what we have got.