"Nature" makes you sad? What are you some kind of fruitcake? The only thing wrong with the planet is that human civilization is a virus that has been allowed to spread out of control. The major diseases are the result of humans trying to manupulate nature. The more human consciousness is used to artificially engineer a system that supports over-population, the worse life will be.
We [america] need to stop feeding populations that cant sustain themselves before the planet becomes so over crowded that humans go extinct sooner than we have to.
What is sad is to think that a species that is considered to be more intelligent than the dinosaurs probably wont last a small fraction of the time on this planet.