> There's actually a lot of doubt regarding that

This is the point where you should be providing quality evidence of your opinion.

https://science.nasa.gov/climate-change/evidence/

> Sure, so if the CO2 nuts were really serious about helping the planet they'd be organizing to plant massive amounts of trees. Not standing in the middle of highways yelling at people.

I suspect that you haven't really thought through the best way of effecting change and are instead just putting forward a political opinion.