...and the people keep living unsustainably, bankrolling dodgy corporations, and voting for dodgy politicians, while not taking any responsibility

Unfortunately, in many places now, new planted trees don't survive the multiple disasters coming one after the other: drought, fire, flood, rinse and repeat.

This is is still better than nothing where they can survive, but we passed the point where we can save ourselves by planting trees.

Number one priority should be on stopping burning fossil. We're getting nowhere close to that. Most countries give themselves pats on the back for adding enough renewable to reduce the % of fossil fuel energy, without actually reducing the absolute number.

and other plants

So what you're saying is, we need to replace all life in the oceans with invasive toxic GMO algae?

That will not work. Because Forrests only store CO2 but won't remove it, you have to add more forest areas. Currently the store around 900 gigatons of CO2 and occupy 30% of the land mass. We produce about 33gigatons of CO2 each year (this is just a emission btw the real number through land change etc is higher) which means we would need to plant trees on 1% of earth each year, which is not sustainable for more than 50 years.