Nice try, skeptics.
Some climate-change deniers suggest that the 0.04% amount of the trace gas CO2 in the atmosphere falls far short of what it would take to make a difference. Climate Adam demonstrates in a radical way that a teeny bit of some things is just too much.
Here are some other things we know about that are deadly in teensy doses:
If there's more than 0.00003 ppb (that's parts per billion, my friend) of dioxin in drinking water, the EPA wants to know about it. Pronto.
Again, more than 2 ppb in water, and there's a problem.
This stuff, formerly used in manufacturing, is also deadly to drink. The EPA reckons anything over 0.5 ppb is an issue.
And then there's arsenic.
So, yes, 0.04% carbon dioxide is honestly a bad, bad thing.