When the Environment Destroys Itself?

A question recently occurred to me about the nature of environmentalism, and while I know that it inherently points out the illogic in their philosophical system I still wonder if this question has actually been addressed before. Now we know that environmentalism holds that it is wrong for man to alter nature to suit his needs, such as burning fuel or felling a forest, since this would constitute destruction of the environment. However, how do environmentalists view the phenomenon of the environment destroying, well, itself?

For instance, volcanoes spew smoke and pollute the air, don't they? Environmentalists get mad when men pollute the air, so why not volcanoes too? Surely that kills birds. And what about natural oil reserves leaking from the ocean floor into the water and polluting it? Man need do nothing for that to occur, and surely that kills oceanic life. And heck, how about how celestial bodies treat each other? What if the sun goes supernova in a few billion years and destroys earth, eradicating everything we currently call the environment? Are people waging protests on how the sun may be violating earth's rights? And let us not forget that wild animals kill other wild animals, that it's possible for one species to drive another out of existence without man's help.

The environment, in one form or another, hurts itself and can be made inhospitable to life. Man has the mental powers and technology to improve things so that life flourishes, so that environmentalists concentrate so much on preventing man from doing this reveals a dishonest intention.