Look Deeper into the word
"Sustainability" is a very popular and somewhat jargonistic term nowadays, and therefore we need to be somewhat skeptical of how it is used. Many lumber products are labeled as "sustainably harvested," "managed forest product,"harvested with sustainable practices," etc.... What do these phrases mean? I have no idea, because they are not directly connected to national and internationally recognized/sanctioned standards.
FSC is one such recognized organization with published standards and practices that includes VERIFICATION and "chain of custody" tracking. Verification is key to sustainable practices, so if any woodworker cares about future generations, the future of the environment, and therefore our wood supply, then it is a great idea to pressure and patronize vendors who provide real, verifiable, sustainable wood products.
Furthermore, this act alone will help sustain our own North American forest products services (jobs and rural communities). As a corollary, much of the exotic hardwoods we love to work with come from fragile, at risk rainforests, fragile countries which are prone to peddling in black market products, and change hands at so many instances along the supply chain that it is nearly impossible to trace its legitimate provenance -- in other words, using exotics is likely going to make us parties to serious environmental and social degradation. Sorry, but the truth isn't always pretty.