 There's actually a report back in the late 80s, the Bruntland Report, that talks about meeting today's needs without sacrificing the needs of the future. And that's one that's kind of become somewhat of a de facto philosophical definition. How I look at sustainability is looking at it in a broad context is looking at every decision from a systemic standpoint. In business, we frame it as people, planet, and profit. So if you're looking at just profit as a business, you're not really addressing the other elements.