quote:
Dawkins doesn't understand the second law of thermodynamics. We know that the second law is valid, hence we know that evolution does not contradict it. The complexity of life does not come from the energy of the sun, as Dawkins mistakenly thinks. It comes from the complexity of the sun
So what you are saying is that Dawkins is mistaken to believe that the Second Law of Thermodynamics is about thermodynamics. I think that just maybe you might want to actually think a bit more about that one. For instance you might consider the etymology "thermodynamics" or how a perpetual motion machine contradicts the Second Law (here's a hint - neither have anything to do with "complexity").
quote:
It is not evolution that violates the second law, it is the theory of natural selection that violates the second law.
Well that is interesting because even under your misunderstanding of thermodynamics it simply isn't true. Natural selection is about differential reproductive success and the consequences of it. Complexity is completely tangential to natural selection.
Dawkins is making two points:
Firstly thermodynamics is about energy transfer. The energy from the sun makes life possible - and therefore reproduction and therefore natural selection. "...energy from the sun powers life." In fact all of the actual construction of the complexity that Dawkins is talking about is powered by energy ultimately derived from the sun. You need to understand that Dawkins is talking about the complexity of the phenotype - the full physical form of the animal or plant - and that phenotype is built up by the biological processes of reproduction and growth.
The second point is his old point about the power of cumulative selection over pure chance rearrangement. By preserving the successful variations natural selection enables complexity to "increase" - in that the distant descendants of an animal might be significantly more complex than there remote ancestor. But it is an enabling role - natural selection does not generate complexity. Natural selection preserves the successful variations, allowing change to build on what came before. So, in some lineages there is an increase here and an increase there and they all add up. Others remain relatively simple. And a few others settle into lifestyles where they don't need that complexity after all and become simpler.
To sum up:
Natural selection plays a crucial enabling role in the accumulation of complexity in some of the lineages of life.
The energy of the sun powers reproduction and growth, the processes which enable natural selection, as well as producing the complexity that Dawkins is actually talking about.