Sustainability Defined

I'm sure out there some where is an agreed-upon definition of sustainability. I'll put down, then, the general idea of what it means to me:

Sustainability: Meeting both environmental and financial needs.

Too often environmental ideas become stalled because they don't make business cents.

Too often businesses or their ideas don't get support because the don't make environmental sense.

Sustainability is the idea that brings these two parts together into a cohesive solution, a balance between the two. We must be careful not to throw too much onto either the environmental or the financial for risk of unbalancing the equation.