You know, I still keep seeing the second law of thermodynamics being used as an argument against evolution, despite multiple thorough rebuttals. So let me add a few words of my own in an effort to stem the flow of stupid.
The argument, loosely summarized, goes like this:
- The Second Law of Thermodynamics says that entropy must increase in any closed system.
- Since life from non-life requires complex molecules to form from simple molecules, life could not arise by chance, because this would violate the 2nd Law.
- Since mammals and birds and fish are all more complex than single-cell organisms, they could not have evolved, as a system cannot become more complex over time.
The rebuttals for this are, quite simply:
- The Earth is not a closed system. We receive about 1.3 kJ of solar energy per square metre per second, every second, always. The second law of thermodynamics does not apply.
- Life from non-life is abiogenesis, not evolution. But abiogenesis is thought to have been driven by heat and chemosynthesis, so again there is an input of energy.
- Lastly, and most ironically, the very people who claim that single celled organisms couldn’t possibly become complex, multicellular organisms, themselves grew from a single cell. So it’s good enough for them, but not any other organism. And secondly, the argument using thermodynamics against evolution proposes, instead, the sudden appearance of all living things. Like that doesn’t violate the laws of thermodynamics. Sheesh.
But wait, there’s more. You see, the argument that evolution is impossible because of the second law was widely promoted by the likes of Drs. Henry Morris and Duane Gish of the Institute for Creation Research. Please note that these gentlemen, at the time they made these claims, had doctorates in Engineering and Biochemistry respectively. Which means they understood the laws of thermodynamics, and would have known that the argument was wrong. Which means they were blatantly lying.
The fact that this argument is still being presented as evidence against evolution is appalling, and shows just how ill-informed the anti-evolution movement really is. Feel free to send anyone you find using this argument to this page, or for a more torough thrashing, to the Talk Origins Thermodynamics FAQ.