Answer:

This passage describes the devastating effects of man's pollution of the environment, which is largely irreversible and has a chain of negative consequences. It explains how radiation and chemicals can enter the environment and reach humans, and how this process is accelerated by man's activities. It highlights how life has adapted to the environment over millions of years, but that the modern world does not allow for this adjustment and the unnatural radiation and chemicals created by humans are causing irreparable damage.