The level of CO2 has risen from 280ppm to 400ppm. Had mankind not been around the level would have risen from 280 to 290 at most due to warming after the Little Ice Age. Instead it has risen to 400ppm.
As for 400 ppm having no effect, that is not true either. The first 20 ppm has a huge effect (i.e. 20 ppm versus zero). The warming decreases with each added 20 ppm, so man's added CO2 doesn't have a very large effect. But without that first 20 ppm of CO2, we would have an iceball planet.
And, by the way, it is 0.04% not 0.004%
how is it known that 20ppm causes warming, or causes a ‘huge effect’? If 400ppm that we have today only amountsw to 0.04%, then how on earth can 20ppm, and even more insignificant amount, be the cause of warming? or is that just a guess?
and yep and increase from 280 to 400ppm sounds scary, just like the alarmists wish it to, but it still only amounts to 0.04% of the TACO2 levels (total atmospheric CO2)- this maount simply is nowhere near enough to create a blanket thick enough around the globe to trap heat- it’s simply impossible for that small amount to accomplish that
Think of it like the following- 0.04% would be very small splotches here and there across the globe- I’m guessing at these figures, but for the sake of visualization, I’ll just say it would bel ike having a splotch of CO2 about a mile wide over Australia, one over japan, one over china, the us perhaps, maybe one over bhudapest, - but the point is, you have these small insignificant pockets of CO2 scattered far apart from each other , and relatively few of them at that, and the rest of the atmosphere is completely free of CO2- infact 99.96% of the atmosphere is free from CO2- in other words, almost 100% of our atmosphere has no CO2 in it
Either that OR, the CO2 formed a blanket- a microscopically thin blanket around the entire globe, a ‘blanket’ so thin that it is simply ridiculous to even suggest that it can trap heat and then reflect it back to earth- CO2 isn’;t even a very efficient heat trapper to begin with- let alone the fact that even IF CO2 blankets the earth, it’s so thin that it can’t possibly be causing rising temperatures