Clean tech has certainly been expanding rapidly over the last 10 years or so. There have been a couple of different cycles and venture capital investments in clean tech. In the last five years, it has certainly very much accelerated.
Pricing mechanisms have been an incentive that has helped many clean-tech companies build financial models and business models that allow them to demonstrate to investors that there will be a return on investment for their venture capital investments. That's certainly true in our case. We demonstrate that when there's a price on carbon, it motivates our customers to better understand, control and ultimately reduce their emissions.