''The argument that the rise on CO2 levels isn't important...

''The argument that the rise on CO2 levels isn't important because levels were much higher when human life couldn't possibly exist is beyond stupidity.''

What is really beyond stupid is the argument that 0.04% of our atmoshphere can dictate our climate.

The oldest fossils, therefore life itself, are 3.7 billion years old - most probably life forms that depended on CO2 to exist.