Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense. ...

When civilization stands at the edge of a cliff, a step forward doesn't make much sense. (Denis Hayes)

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Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.

Denis Hayes Quotes: When civilization stands at the edge of a cliff, a step forward doesn't make much sense.