"I think that the environmental movement is wisely moving away from a largely emotion-based argument for the spiritual or intrinsic value of Nature with a capital "N" and evolving toward a very hard-nosed case for the economic value of natural capital, ecosystem services, biodiversity, etc."

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It's actually quite common for presidents to believe that future generations will render a verdict on their presidencies that is more lasting or definitive than the judgments of their contemporaries. The reason is that although history is certainly "an argument without end" - we're still debating many age-old questions - time does help settle others.

— David Greenberg