Large-scale tree planting can remove some CO2 from the atmosphere, but nowhere near as much as humans add by extracting and burning fossil fuels. See https://skepticalscience.com/1-trillion-trees-impact.html for a detailed assessment of what this looks like.
The IPCC has a chart showing what actions need to be taken over the next few years. Afforestation is one piece of many things, all of which we need to do.
It’s the only reason neoliberals do anything.
There was a post the other day about how painting rooftops white could reduce temperatures, with a small handful of people saying they’d “consider it when their roof needed replacing”.
The only way that idea would have an impact is if there were strong regulations and incentives backing it to encourage widespread adoption.
The only way we’d ever get those regulations from a neoliberal politician is if they had shares in a white paint company.