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ERoEI

New study says solar panels have repaid their fossil fuel debt

Phys.org reports: The climate friendly electricity generated by solar panels in the past 40 years has all but cancelled out the polluting energy used to produce them, a study said Tuesday. Indeed, by some calculations, the so-called “break-even point” between dirty energy input and clean output may already have arrived, researchers in the Netherlands reported.

The mineral pie is shrinking, and most of what’s left is in the sky

Ugo Bardi writes on Cassandra’s Legacy: The essence of propaganda, as it is well-known, is not so much telling lies, but presenting only one aspect of the truth. That’s true also for the depletion debate. Saying that a certain resource will last decades, centuries, or more is not a lie, but not the truth, either.

Is renewable energy really environmentally friendly?

Robin Delobel writes: The issue is rarely raised, but renewable energies have a heavy environmental impact when the total production chain and overall product life-cycle is taken into account– particularly, the stage of mining the metals needed in their production. In addition, chemical products used in the mining operations often lead to severe long-term pollution.

Gail Tverberg: How Peak Oil was misunderstood

Instead of the scenario envisioned by many Peak Oilers, it’s likely that we will in the very near future hit a limit similar to the collapse scenarios that many early civilizations encountered when they hit resource limits. We don’t think about our situation as being similar, but we too are reaching decreasing resources per capita.

How viable (and sustainable) are solar PV systems? A debate

Post the Paris climate agreement, the world looks to solar energy more than ever to reduce carbon emissions and counter climate change, with multi-billion dollar solar programmes announced by just about every major country. But just how efficient,  and environmentally sustainable is the celebrated solar photovoltaic technology? Here’s what some leading voices have to say.