Deadly Gas

I was reborn and turned into a particle of carbon dioxide. At the beginning, I was almost eaten by weed photosynthesis, but fortunately I awakened the [Carbon-based Dominator] system! As long as you breathe, you can split infinitely; with a thought, the non-toxic waste gas instantly turns into highly toxic carbon monoxide! Or turn into other gases instantly! I wanted to transform into the God of Death, suffocate the world, and dominate the world... It turns out that I found a cheating setting: every time I kill a creature or destroy the earth's environment, my life force will be lost crazily! I have the ability to destroy the world, but in order to survive, I am forced to become the "environmental guardian" of the earth? Looking at those bad people who are trying to pollute the environment, my backhand is to purify... Since I can't be the King of Destruction, then I will be the most troublesome "friend of plants" on the planet! (This book is also known as "I Wanted to Destroy the World But I Was Forced to Save the World" and "About Me Turning into Poison Gas but I Have to Protect Humanity")