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The Unifying Principle: Here s Why The Political Divisions In The US Today Cannot Be Mended
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Sentencing Law and Policy: Kennedy child rape case
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The energy transition isn’t just sounding the death knell for fossil fuels. According to some experts, it has also revealed flaws in an idea that has bugged some academics for decades: As we move to less energy-dense fuels, could we end up without enough surplus for society?
At the heart of this debate is one of the most important physical metrics you’ve never heard of: energy return on investment, or EROI.
Devised in the 1980s by systems ecologist Charles A.S. Hall and others, the basic principle behind EROI, also called energy returned on energy invested, is simple: A source of energy is only useful if you can get more energy out of it than what you put in.
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IMAGE: The fossil remains of extinct creatures (here: bryozoans and fragments of crinoids) were the basis for studies on the interaction of long- and short-term temperature changes in the course of. view more
Credit: Photo: Axel Munnecke.
Changes in climate that occur over short periods of time influence biodiversity. For a realistic assessment of these effects, it is necessary to also consider previous temperature trends going far back into Earth s history. Researchers from the University of Bayreuth and the University of Erlangen-Nuremberg show this in a paper for
Nature Ecology and Evolution. According to the paper, future climate-related species extinction could be less severe than predictions based only on the current trend of global warming. However, the researchers do not give the all-clear. At present, the effects of climate change are being exacerbated by human intervention.