Kaya

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L’équation de Kaya

« Dans la quête aux réductions d’émissions de CO2, on parle régulièrement de différents leviers : démographie,
décroissance, sobriété, efficacité énergétique ou encore mix énergétique. Pour comprendre l’impact de chacun de
ces termes, il est commode de se servir de l’équation de Kaya. Cette équation, que l’on doit à l’économiste japonais
Yoichi Kaya, décompose les émissions de CO2 énergétiques (donc qui proviennent de la consommation d’énergie)
selon une formule mathématique qui n’est qu’une tautologie, mais qui donne un axe de lecture intéressant. Dans
« Environment, Energy, and Economy : strategies for sustainability« , il écrit en 1997 que la quantité de CO2
énergétique émise dans l’atmosphère est égale à l’intensité carbone de l’énergie, multipliée par l’intensité
énergétique du PIB, multipliée par le PIB par habitant, multiplié par la population. » … Simon Yaspo.

Oil and gas equipment intended to cut methane emissions is preventing scientists from accurately detecting greenhouse gases and pollutants, a satellite image investigation has revealed. Energy companies operating in countries such as the US, UK, Germany and Norway appear to have installed technology that could stop researchers from identifying methane, carbon dioxide emissions and pollutants at industrial facilities involved in the disposal of unprofitable natural gas, known in the industry as flaring.
Antarctica’s sea ice levels are plummeting as extreme weather events happen faster than scientists predicted
As the northern hemisphere burns, experts feel deep sadness – and resentment – while dreading what lies ahead this Australian summer
Three brush fires burning in rural areas across Riverside county, where 1,000 homes are under evacuation orders
Examination of trees alive at the time shows three years of severe drought that may have caused crop failures and famine
Wind, water and solar energy is cheap, effective and green. We don’t need experimental or risky energy sources to save our planet
Letters: I risked prison to stand up against an system that will lead to ecological and societal collapse – we must look for alternative economic models, writes Zoe Cohen
Letter: Scientists and academics including Prof Gesa Weyhenmeyer and Prof Will Steffen argue that we must discuss the threat of societal disruption in order to prepare for it


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