The Finnish carbon sink project Hiilipörssi ("carbon exchange") has this tagline on their English information page:
Did you know that restoring peatlands is one of the most cost-effective ways to mitigate climate change?
The project is supported by the Finnish Association for Nature Conservation which is the leading Finnish environmentalist organization, as well as the philantropic foundation Koneen Säätiö, and has received coverage from the Finnish public broadcasting company YLE eg. here.
I do not question that a living swamp is a very effective carbon sink. However, the anaerobic environments present in swamplands also produce significant amounts of swamp gases including methane, another greenhouse gas. The United States Environment Protection Agency lists methane's global warming potential as 28-36 over a period of one hundred years (whereas carbon dioxide is the baseline of 1) taking into account methane's shorter lifespan but also its greater energy absorbtion and the fact that methane is a precursor to ozone, another greenhouse gas.
Considering the marsh gas emissions of a peat bog, is restoring peat bogs beneficial in slowing down climate change?