Is anything too extreme to save humanity?

I am not optimistic that humans will be prepared to make the changes required to ensure the continued survival of the human race. While environmental and global warming concerns are accepted as real by the majority of scientists, there are other concerns too. For example, we are rapidly approaching the stage when the global consumption of oil exceeds our ability to extract oil from the earth. We are using up the natural resources, and this is still accelerating. Currently, a small part of the world's population consumes the majority of natural resources, and as others become richer, this will only accelerate and all the negatives will increase.

How can we achieve change? Only by the most strenuous means possible - after all the survival of the human race and our children's children is at stake. Should we be genteel and moderate, or strident and demanding? I suppose it all depends on how urgent we think the problem is.