Good and Evil Part 3, Perspective II

The current scientific estimate is that all life on earth will end in a billion years. There is nothing that can be done. So no matter what you do it will all eventually end. Those who wish to "save the earth" are only doing so for a short time, in relative terms.

http://en.wikipedia.org/wiki/Sun

"In fact, even during its life in the main sequence, the Sun is gradually becoming more luminous (about 10% every 1 billion years), and its surface temperature is slowly rising. The increase in solar temperatures is such that in about a billion years, the surface of the Earth will become too hot for liquid water to exist, ending all terrestrial life.["

Of course, we all have a shorter timeline, i.e. until our own deaths. Some believe they can achieve partial immortality by having children. For those who acknowledge evolution, a million years from now mankind descendant's, if they survive, will have changed, possibly into multiple branches. And possibly none representing anything they exists today.

The shape of the earth is changing, the continents are drifting. In one theory the fertile crescent region may have turned in deserts over the last 10,000 years because the Indian subcontinent smashing into Asia. The additional heights of the mountains may have shifted wind patterns.

The most recent ice age peaked 20,000 years ago ending about 10,000 years ago. This global warming took place without man's significant contributions.

Then there are things like the Yellowstone caldera. This super volcano last erupted 640,000 years ago. Its previous eruption was 1.3 millions years ago. So it could erupt in the next 100,000 years, destroying most of life in the western United States.