If plants are carbon neutral and animals produce CO2, why not eliminate superfluous food chains?
That could break your link to the food chain, Richard? Plants and animals as a whole use and recycle the same carbon. Carbon is added to the cycle by volcanoes (natural) and the burning of fossil fuels (man made). The interactions of life cycles on earth are still a great mystery. Removing snakes may allow mice to grow unchecked until they invade and destroy all beehives and end pollination of useful crops. Best not to tinker with that which even Mother Nature must struggle to get right. Restoring species to a world that has greatly changed may not restore the world as we know it. Interesting thought though.