How do we find the best solutions to the universal problems we are faced with? Sustainability is more about the attempt than it is about the end result because it is often the case that the "best" or most sustainable to do things hasn't been discovered yet.
In terms of your business, sustainability is more about making informed decisions and cutting consumption in places you can control than it is about finding the ideal "net zero" solution. Realistic implementation of sustainability is about small percentages applied to much larger ideas.
If we can keep our decision making process grounded, we have the ability to make real changes over time that will result in significant, measurable, and valuable savings. If we frame all of our decisions only in terms of a singular end goal, it becomes significantly more difficult to find the right path. Small decisions, small reductions, and realistic goals are the key to reducing our environmental impacts and saving money.