All you did was step around the problem. I am not arguing that what is fed to livestock should be fed to humans, I am saying that livestock take up useful space, pollute the air with methane (which is near to 100x a more potent greenhouse gas than CO2), that the lands are cleared of their native plants to feed the ever growing meat industry, and on a large scale animal feed has to come from somewhere (which is why I bring up the inefficiency of not sourcing the energy from autotrophs). Animal feed may be inedible, but it is also grown specifically to be feed. I am not suggesting the complete veganizing of the whole planet, just the meat on a large scale is killing the planet.