The planet Earth, though not threatened with destruction by man-made global warming, is by no means indestructible. There are many unpredictable events within our solar system, and still more outside it, that could make Earth uninhabitable by humans. — Paul Johnson Copy Share Image
The most important fact of this century is not that Earth is threatened in many ways, It is that for the first time in all of its history a decisive means of protecting the home planet exists. It is by… — William E. Burrows Copy Share Image
