Woof, you opened up a little can of worms, eh @Erik Sherburne?
-putting on my biologist hat- Ask a question about investment and slip in your moral reasoning and all the armchair biologists and ethicists pop out of the woodwork! If you ever want some professional wildlife/biology/ecological management advice, DM me and I'm happy to assist you. If I don't know the answer to your question I'll find you someone who is a professional in it. No politics from me, haha!
-putting on my investor hat- As an investment, I think you need to be crystal clear on what you're trying to do here. Not that profit and ecologically sound practices are mutually exclusive, but you need to decide in advance what priority #1 is and reverse engineer things and make decisions to achieve that goal and integrate the lesser goals as you are able.
Timber land is a very long play, easy to screw up without professional help on the front end planning, and easy to get hosed by a depressed market in the future. The positives are that is can potentially be lucrative, especially if your sale is timed well with the market prices, it can be a legacy asset, has extreme tax benefits in most jurisdictions due to agricultural status if planned correctly, and as a bonus can provide habitat for wildlife if planned well.
I wouldn't count on it offsetting your personal carbon footprint unless you are meaning to use it as wood-fired heat/power. You are going to use directly or indirectly a wildly significant amount more carbon in the long time it takes to grow your timber up there in the great white north. Not saying it isn't a good sentiment, but you will probably make more impact on the moral front by designing any property (whether timberland, prairie, or other type) for wildlife habitat and/or restoration of historical ecology instead of carbon sequestration. Don't miss the forest for the (carbon sequestering) trees (see what I did there?!).