Morally, mass species extinction through plenticidal indifference is like the Nazi Hunger-Plan-in-slow-motion
If the Nazi Final Solution had been totally successful, ten million European Jews would have died violently by gas or bullet.
If the Nazi Hunger Plan had been totally successful, thirty million Eastern European Slavs and Jews would have slowly and quietly ebbed to death through hunger and cold.
If extent of intention rather than extent of execution marks the true magnitude of evil - and I believe it does, as do most people who have thought about it, then the Hunger Plan - though too little known - was the far greater Nazi evil.