But you need to cut those trees down and place them somewhere they won't rot
Sink them to the bottom of the deep ocean, but trees famously float
Leave them in deserts where the dryness will suppress rot, but damage the desert habitat
Dump them in peat bogs, but there aren't enough
Perhaps it would be best to cook them to charcoal, it releases some carbon into the atmosphere, but it would leave some solid, inedible to anything carbon that can be dumped in any old mine, but that's expensive
Also if you dump the whole trees in whatever way, you also dump whatever nutrients are in it
Renewable energy being the cheapest energy really, really helps
Carbon capture being expensive is unfortunate. It would be nice if we could cheaply use fossil fuels and keep the carbon out of the biosphere, but we can't, so we should just use renewable energy, and big countries can also use nuclear until we run out of fissile material