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Trees only hold carbon until they fall and rot. It's not a permanent solution.

Trees don't vanish into clouds of CO₂ on impact with the ground.

Time-to-rot varies, from 50-100 years for a spruce, 200-300 for a pine.

I've witnessed downed redwoods myself, over the course of four, nearly five decades, which have failed to decompose even in highly damp conditions.

Bogs and swamps are also underappreciated CO₂ sinks.

And then when they fossilize, they sequester even more! ...until, of course, humans come along and unsequester it.