Carl Sagan once wrote that we are in no danger of destroying the world, or life on this planet. We are only in danger of destroying ourselves. He's right. Once life has taken a hold it is very, very difficult to get rid of. Just look at the history of the earth. Mother Nature and the Universe have created catacylsmic events that we can't hope to come close to (barring nuclear annihilation) and yet life has continued. More than once, in the earth's history, have there been events that have wiped out the vast majority of living creatures, and yet life still goes on. No, we won't destroy "Mother Earth" or even damage her significantly. We will only succeed in destroying ourselves. No matter what we do she, and life will continue.
Now don't get me wrong, I would like the human race to survive. I think that a lot of what people are suggesting are great ideas, but I think they only really scratch the surface, and while making some differences, only prolong the inveitable. People love to talk about driving "hybrid" cars. Great, yes it saves on oil, but it also takes a considerable amount of petroleum to produce all the plastic that helps make those cars lighter so they get better gas mileage. People want to tout their opinions here on Chef Talk, but your computer is loaded with plastic, a petroleum product, and is powered by electricity, which is probably produced by coal powered plants. We stretch our natural resources to the limit yet we continue to find ways to prolong life, fight diseases, and find ways to "cheat" death, allowing more and more people to procreate and live longer, healthier lives thus using more and more of our resources. The solutions I have seen here are not really solutions, as I see it, but merely a way to prolong the inveitable outcome. It buys us some time, a generation or 2, maybe 3 or 4 at the most. If you really want to "save the planet" then you really need to be willing to make more changes than you have proposed here. Sustainable agriculture is part of that and so is the conservation of our limited natural resources, but it also includes demanding that corporations start seriously researching alternative fuels, the willingness to pay higher prices as new technologies are discovered and refined. It also includes really stepping up our space exploration program to help us discover ways to exploit the resources of other planets. The other option (one that really is not an option, in my opinion) is population control. Controling birthrates, encouraging euthanasia and the end to attempting to eradicate disease and starvation. Someone earlier used the rabbit analogy, and it goes for humans too, just over a longer period. The more people we allow to live, the more people there will be to reproduce and our population will continue to increase. All other animal populations have always been kept in check by Mother Nature, but we no longer have those checks and balances. Given that, our population will continue to grow and grow. Someday, dispite all such attempts we will outgrow our natural resources and ability to produce enough food
This is the middle ground between the 2 extreme views. Those on the side that view this as issue as a bunch of lies started by the "tree-hugging hippies" have their heads in the sand. Those that promote conservation and sustainable agriculture are fooling themselves if they really think it will make a difference in the long run. The reality is, if you want to save us from ourselves then some very drastic measures must be taken, anything else just slows down the inveitable.