"From a young age, I've viewed the animals we abuse and kill as akin - functionally, intellectually and emotionally - to small children. Small children are vulnerable. Typically, they don't need "liberating". Infants and toddlers in particular need looking after. The problem - when I was a teenager - was that most of interventions I could think of to alleviate wild animal suffering might easily make things worse in the long run. Thus if we sought to rescue herbivores, then obligate carnivores (and their young) would starve. If we were to phase out carnivorous predators altogether, then there would a population explosion of "prey" species. Lots of herbivores would then starve too. The food chain seemed an inexorable fact of the world - a fact as immutable as, say, the Second Law of Thermodynamics. Only after reading Eric Drexler's classic "Engines of Creation: The Coming Era of Nanotechnology" did I gradually come to realize that there were technical solutions to all these problems - notably in vitro meat, immunocontraception, neurochips to modulate behaviour, nanobots to manage marine ecosystems, and ultimately rewriting the vertebrate genome."