Still consider this. Things decompose only slowly in a landfill. But when they do, they decomposed into methane because it is a low oxygen environment. And methane is a much more potent greenhouse gas than CO2 is.
Therefore "they'll break down in the landfill" is not as fine as you think it is. The fact that styrofoam will NOT breakdown in a landfill makes it ACTUALLY better as a form of carbon capture. (Although the carbon being captured is actually from fossil fuels, so at best it can be net neutral.)
Still consider this. Things decompose only slowly in a landfill. But when they do, they decomposed into methane because it is a low oxygen environment. And methane is a much more potent greenhouse gas than CO2 is.
Therefore "they'll break down in the landfill" is not as fine as you think it is. The fact that styrofoam will NOT breakdown in a landfill makes it ACTUALLY better as a form of carbon capture. (Although the carbon being captured is actually from fossil fuels, so at best it can be net neutral.)