We Must Keep Atmospheric Oxygen Down to Prevent the Evolution of Giant Insect Monsters!

I understand that the main reason that insects are so small is that they take air in through their skin. This is size limiting because the volume/surface area ratio blows up as they get bigger (it's the same reason that cells divide).

This is all well and good these days. But my main concern is that, in our zeal to prevent global warming, we raise the oxygen levels and trigger an invasion of giant insect monsters. That would truly be an inauspicious end for mankind. So please, people, show some restraint in the war on global warming. And spread the word. Write your congressmen. It is never too soon to practice prevention!

p.s. also, arachnids