How, according to Ishamel, can we save the world? And according to you?

Ishmael says that, in order to save the world, we have to revert to the leaver culture. "You must spit out the fruit of that forbidden tree. You must absolutely and forever relinquish the idea that you know who should live and who should die on this planet." This means that we have to control our population, and allow evolution to continue. It is a huge thing to accomplish, and would take a revolution.

I agree with Ishmael on the end goal of the change. But the amount of change in the human thought process would have to be so immense, that it would take a revolution similar to the Enlightenment. Such revolutions have happened many times through human history, and have completely shaped the progress of the human race.