Okay, not as a direct quote, but she is the lead scientist for the Natural Capital Project described a few paragraphs into this article, and it's her recent presentation that the author is referencing:
Green.view Price fixing: Why it is important to put a price on nature (No, I don't completely understand it either--I'm a geologist, not an ecologist or an economist. And I don't entirely agree that the idea of 'ecosystem services' is the best way to prioritize resource or ecological conservation projects. Still, my sister in The Economist! Shiny!)