Productive forests in the US are a carbon sink.

The trees grow. We cut them down. We make houses out of them, which are wrapped to prevent deterioration. The sunk carbon becomes our buildings.

Other uses of the wood are also usually carbon sinks. Paper either gets recycled (the carbon is preserved) or it gets buried in a sealed landfill where is takes decades or longer to break down.

It'd be cool to calculate how much carbon Weyerhaeuser sucks out of the atmosphere each year.