G Since every type of life always leaves some change behind, does that mean that every type of life also was necessary for all life that followed?

        Perhaps, but I do not believe that one needs to be followed by the other, extinction events of one life form does not necessarily mean the rise of another, better suited for current conditions! I have never been a true believer in the need for population control of grass-eating animals by meat-eaters, The limiting control will always need to be the load-carrying capacity of the food source! Meat eaters simply found a place that satisfied their own food needs, they are never needed to maintain a balance of life for their prey.                            Life is so determined to exist, but can not afford to tie itself to other life with no other options, that is perhaps why even virus must not confine itself to only living in one species, for in doing so their own fate would be sealed! When Europeans came across to the "America's" most of the native population fate was sealed by simple contact, and yet the reverse was not true, why did the Native America's not harbor fatal disease's that the incoming European's have no resistance to? Or are we missing some important information that has not yet been understood?                                                                                                                               The idea that with-out mankind our planet would already be 3000 years into a never-ending ice-age, may very well be the most important observation that we can ever make, now needs to be verified in a timely manner by both scientists of several different fields, and laypersons with at least some scientific background. (this would leave me out on both counts) Math does not lie, however people can, so the more the merrier when it comes to verification of something so important. How many respected scientists were willing to say that there was little or no proof that cigarettes were bad for you, or asbestos, or coal dust, or radiation, or round-up, the list is long! Money will always have a say when there is a lot at stake. The solution's that I have put forth, remove almost any options of mega-corporations to make billions off either removing carbon dioxide from the atmosphere, or being partners in moving water around the planet. yet it will "in the long run" increase the middle class by hundreds of millions, giving those people the income necessary to buy their products. As they say a bird in the hand is worth 2 in the bush, so the over-site of those verifying those observations is doubly important. Yes, I am showing part of my background.                        Mankind's legacy must include both our own ability to overcome our shortcoming, and the ability to forgive others there's. Right now we are all that stands between the slow death of the planet, and the continuation of all carbon-based life on the planet for as long as mankind can remain a viable species on the planet! Dan Reach me at 402-890-7946 I live in Nebraska, U.S.A.