How does it not? Supply meets demand and a price is set. What other price is there for natural capital that would be more "accurate"? Why is natural capital different from capital in general, in this regard?
It's not a difficult concept to understand. The harvesting of and consumption of natural capital (market driven) is based on the difficulty of harvesting, the knowledge (or lack) of the ramifications of harvesting, and the demand for it.
It is absolutely laughable that you think the free market appropriately addresses the long term future ramifications of over harvesting.
How can I make this simple for you to understand, given the near religious fervor you attach to the beauty and utility of the free market? I'll give it a shot, even though I can't nearly address all the issues. I'll just share a few, and hope you understand that there are many many more.
- Palm oil: is palm oil appropriately priced? Consider the costs: habitat destruction not just of the areas harvested, but adjoining areas due to edge effects. Destruction of habitat means species extinction. Species extinction means a reduced rate of bio-productivity on Earth, as well as a reduction of information, which can enhance our knowledge in the future. Biodiversity is information, useful for software, algorithms, material science, medicine. The study of biodiversity allows us to develop new materials (think spider silk), new drugs, new cures, new algorithms, new architecture, new methods useful for cultural growth. Biodiversity allows us to study systems and communities, and learn from those systems. Biodiversity allows the Earth's natural systems to engage in sustainability, soil turnover, atmospheric cleansing, water reclamation, etc.
- The Blue Whale: how did the market price blue whales in the mid 20th century? Did it accurately price blue whales? Ultimately, why did they not go extinct?
- Beef: what is the correct price for beef? Does the market correctly price beef, factoring in the extinction of numerous wolf species which were hunted to death? How do wolves contribute to the environment? Here's a hint: riparian zones and clean water.
- Burning coal and the cost of energy derived from such: what is the cost? Do you know?
- Agriculture: what is the cost? Do the crops use low-till or no-till techniques? What are the differences?
- Solar farms for energy production: what is the cost? Do you know?
I could go on and on.
The point is: any process to extract, harvest, or produce has costs that the market is ignorant of. I suggest you lose your religious fervor for the free market and your belief that it accurately prices things.