on Certification I just found this document
For procurement using certified wood, most folks don’t understand that it is a lot like Green Power. The mill knows how much wood comes from certified forests and they can sell up to that amount and label it as certified. I believe this is the methodology for all system we have discussed. When you buy a individual board it may or may not have come from a certified acre. It gets mixed up in the mill just like power gets mixed on the grid. Green power is the same way, a power company can sell you a portion of their green power production (based on their total green production) but the electricity that comes into your business may or may not have come directly to you from a solar farm.
Also please look at this site which is the proposed SFI standards.
Look at the forest management standard and find the revised and/or combined material on ‘climate smart forestry’ found in objective 9 of this standard. The SFI guidance document has 5 or more pages of backup material on climate smart forestry beginning about page 25. These standards are in the process of revision and this website will be updated probably in March with additional changes.