The carbon dioxide levels in our atmosphere are now higher than they’ve ever been, but there are ways that we can reduce that number by half.

Divide it by 2.

Two guys walk into a bar and both ask for carbon dioxide. One dies. Why?

The first says, "I'll have CO!" The second one says, "I'll have CO, too!"

My dad died in front of me

Before he died, he scribbled me a note. They were his last words. I decided not to open it till I was ready. A year later, I opened it and this is what is said, "You are stepping on my oxygen line".

Edit: Holy macaroni with a side of O2, thank you so much for 190 votes!!!

Edit 2: My, m...

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