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Energy Efficiency, EROEI, Climate change, global warming impact on commercial operations.

GM explains 57 vs 60 kWh Bolt EV battery ratings

Electric Revs

IMG_6231 A label inside the Bolt EV battery pack shows an overall pack energy capacity rating of 57 kWh.

Conflicting values for the energy capacity of the Chevrolet Bolt EV battery pack coming from LG and GM are actually consistent and are just reporting different ways of measuring energy storage capacity, according to GM spokesman Christopher Bonelli.

Recent photos taken during a Bolt EV battery pack disassembly at a GM dealer and in a series of pack disassembly videos on YouTube show that LG labels inside the pack rate it as holding 57 kilowatt-hours (kWh). GM has marketed the Bolt as having 60 kWh of energy storage and have also used that value in documents filed with the U.S. Environmental Protection Agency.

“The 57 kWh number on the battery label is the “rated energy”, a regulatory requirement that represents the absolute minimum energy content (under worse case scenarios), not the energy…

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Faible impact des renouvelables sur les carburants fossiles en Chine

Énergie et environnement

La Chine s’est lancée dans un vaste programme de déploiement d’énergies renouvelables. Mais ces énergies propres remplacent-elles vraiment les énergies fossiles ou ne font-elles que s’y ajouter? Deux chercheurs chinois se sont penchés sur la question et notent que la substitution demeure limitée, bien qu’elle dépasse ce qui a été observé ailleurs dans le monde.

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How much ice is melted by each carbon dioxide emission?


There was an interesting discussion,  for which I did a back-of-envelope calculation, on the Carbon Dioxide Removal google group (inspired by this paper).  I am refining and extending  that calculation here.

F2.largeFigure 2 from Winkelmann et al. (2015) indicating how much Antarctic ice loss is projected to occur as a result of different amounts of cumulative carbon dioxide emission, over the next one, three and ten millennia. Note that 10,000 GtC of cumulative emissions results in about 60 m (about 200 ft) of sea-level rise over the long term (taking additional contributions from Greenland and mountain glaciers into account).

According to the USGS, there 24,064,000 km3 of ice and snow in the world.

According to Winkelmann et al. (2015), it would take about 10,000 GtC to melt (nearly) all of this ice.

If we divide 24,064,000 km3  by 10,000 GtC, assume the density of…

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Les émissions mondiales de CO2 repartent à la hausse

Excellent papier sur les chiffres globaux de consommation d’energie.
Taxer l’Energie consommée est une alternative

Énergie et environnement

En 2017, la croissance de la production énergétique mondiale a été dominée par les carburants fossiles, notamment par un retour en force du charbon. En conséquence, les émissions de CO2, qui étaient assez stables depuis trois ans, ont augmenté de 1,4 % l’année dernière. Il s’agit là des principaux constats du nouveau rapport annuel de l’Agence internationale de l’énergie (IEA) sur le statut mondial de l’énergie et des émissions de gaz carbonique, qui montre une dégradation de presque tous les indicateurs.

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La transition énergétique prendra… 363 ans

Let’s stay positive !

Énergie et environnement

Ken Caldeira, un climatologue du Carnegie Institution for Science, a calculé il y a 15 ans que pour atteindre nos objectifs de réduction de gaz à effet de serre, il faudrait ajouter chaque jour, de 2000 à 2050, l’équivalent d’une centrale nucléaire en énergie propre. Le MIT Technology Review rapporte aujourd’hui que Caldera a récemment calculé où nous en étions rendus. Résultat : au rythme actuel, la transition énergétique ne sera pas terminée avant 363 ans.

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Are We Heading Back into El Nino?

Climate Denial Crock of the Week

el-nino-forecast-feb-2017UK Met Office:

In the waters of the far-eastern equatorial Pacific – close to the South American coast – sea-surface temperatures are beginning to rise, prompting some climate scientists to believe the world could be heading for another El Niño in close succession to the previous event which ended last year.

The last El Niño, which peaked in the winter of 2015-2016, was the joint strongest event on record. It had impacts around the world and the heat released from it added to existing climate change to break global surface temperature records in 2015 and 2016.

Prof Adam Scaife, head of long-range prediction at the Met Office Hadley Centre said: “The El Niño–La Niña cycle hasn’t been very active this winter, but Met Office predictions and those from some other centres are suggesting an increased risk of an El Niño developing by the summer.”

It isn’t unknown for El Niños…

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The Energy Problem behind Trump’s Election

Our Finite World

The energy problem behind Trump’s election is not the one people have been looking for. Instead, it is an energy problem that leads to low wages for many workers in the US, and high unemployment rates in the European Union. (The different outcomes reflect different minimum wage laws. Higher minimum wages tend to lead to higher unemployment rates; lower minimum wages tend to lead to higher employment, but unsatisfactory wage levels for many.) The energy problem is also reflected as low prices of oil and other commodities.

To try to solve the energy problem, we use approaches that involve increasing complexity, including new technology and globalization. As we add more and more complexity, these approaches tend to work less and less well. In fact, they can become a problem in themselves, because they tend to redistribute wealth toward the top of the employment hierarchy, and they increase “overhead” for the…

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