"As you get older, there will be a new challenge arising. What you thought you'd accomplished once, maybe the goal post has shifted and it's not what you're pursuing anymore, because you're not interested in that anymore, you know?"

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What we've often seen is that when we Americans say, look, we've got to reduce pollution, business - some businesses complain about it, but almost every time, it's turned out to be easier and cheaper and accomplished faster, and they've gained confidence, and then we go farther.

— Al Gore