Since we've already touched on the topic of transhumanism and Ramez Naam, I should note that More Than Human is reviewed at Betterhumans today. "Rather than just defending human enhancement, he delineates why we should embrace it, and suggests approaches for doing so responsibly. In regards to life extension, for example, Naam points out that older people are more likely to vote, less likely to commit violent crimes and less likely to prefer militaristic solutions. So why wouldn't we want more older, wiser people in society?" A little too indirect for me - we should embrace healthy life extension because it will greatly reduce suffering and death. Very simple. You can read an excerpt from More Than Human focused on healthy life extension and population growth here at the Longevity Meme.