We are all one people and each is responsible for maintaining Earth's delicate and fragile balance. We are her stewards and must take care of her for future generations. Our perspective on Earth can be very narrow. We may not see the effects of one tree that is cut down. Only by expanding our perspective can we see entire rain forests that have been devastated.
Humans can destroy in a matter of days that which nature took thousands of years to create.
We might ask what harm can one factory do to the environment by not meeting proper pollution controls. The effect from space is obvious. Pictures taken by Gemini astronauts over 30 years ago are much clearer than those taken by space shuttle astronauts today. For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.