On the one hand, he has a reputation for having been a pompous ass at times. On the other hand, this writing of a 90 year old man, clear and lucid, and philosophical and wise. We should take heed. The problem is not to "save the Earth", for we are a speck in time and the Earth will be fine. Life and species will come and go, and even humans are a natural part of the planet, so if we kill off thousands of species, we are no different than other invasive species. What we really need to focus on saving is ourselves - the more destructive we are to the ecosystem and each other, the more likely that human catastrophies will occur. Life on the planet will go on, and perhaps thousands of years from now, there will be but a faint memory of that invasive species - humans - and how they, like many other species, died off, leaving evolution to continue with new life.