I didn't bring it up. The meme posted by OP did because it's a schizopost implying that the evil lizard people want to genocide the common people to preserve the climate.
Your comment was talking about the fact that humans exhale CO2 as an unfortunate fact. I agree with that in and of itself, but in the context of the post one could definitely get the idea that you're propagating the malthusian and exaggerated assumption that the meme is built on. That's how I interpreted it.
If there's no people exhaling CO2, then who would be left to enjoy the infinitessimally better state of the climate?
Unless we have tiny amounts photosynthesizing algie or something similar living in our hair or under your skin. But that also gets into questions of what is you exactly.