This is where you start explaining how trees capture carbon, how much, and where it is stored. Explain how we use trees in large quantities to reduce CO2 in the atmosphere, where and how many? Who should do this and who is going to pay for it? Genuinely curious.
But without those details your comment is just a poor quality and lazy attempt to disqualify people who are actually trying something.
The problem is the majority of a tree's weight is water; to turn a Kg of carbon into tree requires about 1.8 Kg of water (that's from memory but it's order-of-magnitude right). This isn't necessarily a non-starter but it's a huge practical problem with trees in particular (IIRC bamboo is a better candidate).
Growing trees then cutting them down and burying them is actually a decent carbon capture mechanism, except for the fact you're then depleting your soil and you'll need to burn even more CO2 making more fertilizer...
That works really well until the trees catch on fire, which has been happening more frequently in recent times.