This smells like some really bold and really ridiculous PR attempt. "Ikea uses about one percent—yes, one percent—of the world's entire commercial wood supply. That amounts to about 17.8 million cubic yards of lumber last year. " [1] I guess they need this PR purchase to appease some eko organization. And this is equally ridiculous. Ikea is making furniture, something people really need. Why they have to explain them…
Well, in terms of carbon in the atmosphere, making furniture from wood actually makes a lot of sense, assuming you use sustainable forestry (replant the same amount or more). That carbon in your furniture isn't going into the air anytime soon, hopefully never.
It's a shame that wood is not as popular nowadays.
Of course people should regrow two trees for every one cut.