"We need to put a price on carbon. This needs to be a priority for all of us in how we vote."

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We can come up with a working definition of life, which is what we did for the Viking mission to Mars. We said we could think in terms of a large molecule made up of carbon compounds that can replicate, or make copies of itself, and metabolize food and energy. So that's the thought: macrocolecule, metabolism, replication.

— Cyril Ponnamperuma