“In physics, energy has a very precise definition: it is what characterises something changing in the world surrounding us. [...] Counting energy is therefore nothing else than counting how much the world has changed.”

— Jean-Marc Jancovici

Source: "Energy: basic facts for an informed debate" https://www.youtube.com/watch?v=lRAMA4mT0z0, 2012.

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Jean-Marc Jancovici 2

French engineer and energy climate specialist 1962

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