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François Marechal

@francoismarechal

Professor in Ecole Polytechnique fédérale de Lausanne (EPFL), industrial process and energy systems engineering. Think systems ! Posts are my opinion My research group : http://ipese.epfl.ch

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Latest posts by François Marechal @francoismarechal

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FAO Food Price Index rises in February for first time in five months New forecasts also point to reduced wheat plantings in 2026 as farmers respond to lower prices.

Food prices were already rising before this latest war began... with oil and fertilizer prices rising, food prices are likely to rise further and drive up world food insecurity.

www.fao.org/newsroom/det...

07.03.2026 01:26 👍 19 🔁 14 💬 1 📌 1
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I'I've been getting a lot of calls about the industrial food system's vulnerability to fertilizer import shocks. Here's an interactive widget: slide through the months to see who imports what, when, and through which chokepoint.
rajpatel.org/2026/03/06/f...

Stop the war. Stop the dependency.

06.03.2026 19:23 👍 9 🔁 6 💬 1 📌 1

People need metabolic energy (food:100 W year/year/cap) and energy services. The crisis is a fossil based solutions crisis created by rusted-tech industries and lobbies.

08.03.2026 13:15 👍 0 🔁 0 💬 0 📌 0
TreaTech – Revolutionizing waste treatment

In a rational world, the efficiency of liquid organic waste treatment will be measured by:
- biogenic carbon not released into the environment
- renewable energy harvested, stored and distributed
-minerals and water recovered and reused
For each unit of waste. Look at this technology trea-tech.com

08.03.2026 08:57 👍 1 🔁 0 💬 0 📌 0
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Meanwhile, Spain's massive investment in renewables is paying dividends now: with prices for Spanish industry and consumers low and stable compared with other European economies.

www.ft.com/content/ac77...

06.03.2026 16:39 👍 1111 🔁 501 💬 18 📌 54
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Renewable Energy and National Security The wind and the sun don’t need to transit the Strait of Hormuz

Took a while for @pkrugman.bsky.social and the US to find out, but better late than never:

Renewables make us less dependent from crisis….

open.substack.com/pub/paulkrug...

07.03.2026 13:33 👍 10 🔁 6 💬 1 📌 0

The solution is simple: invest in renewables based energy services : heat pumps, human based and electrical mobility , circular economy and integrated food production and management.
Cheaper, based on local economy, supply chains and resources, higher security of supply with less energy targets

07.03.2026 10:32 👍 0 🔁 0 💬 0 📌 0
My global decarbonisation pathway, built on www.climatewedges.com

It deploys 20 wedges to limit global warming to 1.5 degrees.

My global decarbonisation pathway, built on www.climatewedges.com It deploys 20 wedges to limit global warming to 1.5 degrees.

An infographic showing the 36 strategies that can deliver at least a wedge of mitigation.  It explains the scale of deployment each one needs, across the electricity, industry, buildings, transport, and land use sectors.

An infographic showing the 36 strategies that can deliver at least a wedge of mitigation. It explains the scale of deployment each one needs, across the electricity, industry, buildings, transport, and land use sectors.

There is no single “correct” path to decarbonise.
There are six trillion.

Our new paper in Science puts 36 climate solutions into one common unit, so you can build your own pathways.

Paper: doi.org/10.1126/scie...
App: climatewedges.com

What would your pathway look like?

06.03.2026 09:33 👍 31 🔁 21 💬 1 📌 1
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#environmentalhealth #noiseresearch #healthequity #publichealth #environmentalepidemiology #transportnoise | EEA - European Topic Centres 🔊 𝗩𝘂𝗹𝗻𝗲𝗿𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝘁𝗼 𝗧𝗿𝗮𝗻𝘀𝗽𝗼𝗿𝘁𝗮𝘁𝗶𝗼𝗻 𝗡𝗼𝗶𝘀𝗲 𝗶𝗻 𝗘𝘂𝗿𝗼𝗽𝗲 In our recent report, we frame vulnerability as the interplay between susceptibility (biological, psychological, or behavioural traits) and situationa...

Check out our new review on the effects of transportation noise on vulnerable population groups for the @eea.europa.eu.

👉Everybody is at risk from noise but some groups clearly need additional protection.
Also a question of equity and solidarity.

www.linkedin.com/posts/eea-eu...

07.03.2026 08:06 👍 3 🔁 3 💬 0 📌 0

Chemical engineering approaches to plastics. No need to go to syngas, no need to hope for high carbon and energy efficiency biochemistry. System engineering of future #refinery.

06.03.2026 15:45 👍 0 🔁 0 💬 0 📌 0

Defense department ? Formerly war department ?

06.03.2026 13:24 👍 0 🔁 0 💬 0 📌 0

Who is surprised ? Why complain ?
The winners:
Gamblers ?
Putin ?
Renewable energy based communities ?

02.03.2026 22:52 👍 0 🔁 0 💬 0 📌 0

The world is getting a reminder, once again, of the enormous economic and geopolitical risks associated with dependable on fossil fuels. And a reminder of the incredible independence that renewable energy provides from those risks.
#fossilfuels
#renewableenergy
#iran

02.03.2026 17:15 👍 106 🔁 30 💬 4 📌 3

@governor.ny.gov wants to weaken NY's GHG accounting, using lenient accounting for methane to make it easier to “meet” climate goals. This is akin to “improving” public safety by giving weekends off to police to reduce costs & only counting crimes committed on weekdays (to paraphrase Anshul Gupta).

02.03.2026 17:19 👍 7 🔁 3 💬 0 📌 0
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How Elon Musk’s Sci-Fi Hyperloop Failed Before his misadventures in government efficiency, Musk promised to revolutionize commuting with a subway that would speed passengers between DC and Baltimore in a matter of minutes. The project was a...

flip.it/sD2HNA

02.03.2026 07:34 👍 0 🔁 0 💬 0 📌 0
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Swissmetro - Wikipedia

How Elon Musk’s Sci-Fi Hyperloop Failed

The idea was not new: en.wikipedia.org/wiki/Swissme...

The method: lying to investors , stealing innovation from universities, … was innovative and recognised by investors.

Let’s learn from the failures and define rules to make con artists accountable

02.03.2026 07:34 👍 0 🔁 0 💬 1 📌 0
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Based on daily values, the February average of atmospheric CO2 at Mauna Loa was ~429.4 ppm; that's 2.3 ppm higher than last year. We made our climate problem worse again.

01.03.2026 14:47 👍 29 🔁 17 💬 1 📌 0
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Non, les femmes étrangères ne sont pas plus violentes que les hommes suisses | RTS Une publication de l'UDC sur les réseaux sociaux affirme, statistiques à l'appui, que les femmes étrangères sont plus violentes que les hommes suisses. Notre fact-checking montre que cette affirmation...

Forgot the link : Non, les femmes étrangères ne sont pas plus violentes que les hommes suisses www.rts.ch/info/suisse/...

01.03.2026 15:05 👍 0 🔁 0 💬 0 📌 0
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According to the @‌ipcc.bsky.social, marine heat waves have doubled in frequency and have become longer-lasting, more intense, and more extensive since the 1980s.

Urgent #ClimateAction is needed to #SaveOurOcean and ensure a sustainable future for all.

01.03.2026 15:00 👍 16 🔁 12 💬 0 📌 0

Non, les femmes étrangères ne sont pas plus violentes que les hommes suisses.
Si 3600 hommes suisses sont violents, statistiquement il y en a 1200 qui votent UDC, il y donc presque autant d’hommes UDC qui sont violents que des femmes étrangères (1300) … une solution ?

01.03.2026 14:57 👍 0 🔁 0 💬 1 📌 0

A poll in football supporters and hooligans

28.02.2026 13:36 👍 0 🔁 0 💬 0 📌 0

Do not forget to add the tariffs on top…

28.02.2026 13:28 👍 0 🔁 0 💬 0 📌 0

For an industrial application, both adsorption and desorption steps need to be considered and the thermodynamic (exergy) expense of the system to captured CO2 (say at 70 bar liquid) needs to be reported to be declared as a CO2 capture solution. Here it is demonstrated that CO2 can be absorbed.

28.02.2026 13:20 👍 0 🔁 0 💬 0 📌 0

This redefines media space: self reduce the offer… read books

26.02.2026 23:14 👍 2 🔁 0 💬 0 📌 0

Assuming that we pay the same price for the energy services, army should invest in renewables to finance other expenses needed for defense.

26.02.2026 22:49 👍 0 🔁 0 💬 0 📌 0

So the investment in rooftop solar panels should therefore be part of the defense spendings.

25.02.2026 23:16 👍 2 🔁 2 💬 1 📌 0
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Ukraine is showing why electrification is key to Europe’s energy security At this year’s Munich Security Conference, leaders repeatedly warned that a new era of geopolitical instability is reshaping global security. Energy was central to that discussion, with governments em...

Even if global warming was not such a pressing issue, renewables are not only more affordable and less price-volatile than single-use fossile fuels, they also increase a country’s resilience in armed conflict.
www.reuters.com/sustainabili...

25.02.2026 22:52 👍 133 🔁 60 💬 1 📌 6

List of problematic countries here …

25.02.2026 12:51 👍 0 🔁 0 💬 0 📌 0
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An innovative approach to bio plastics, with a bio refinery systemic design focusing on valorising the gift from nature: biogenic carbon and renewable energy harvested from the solar irradiation by… | Francois Marechal An innovative approach to bio plastics, with a bio refinery systemic design focusing on valorising the gift from nature: biogenic carbon and renewable energy harvested from the solar irradiation by photosynthesis.

www.linkedin.com/posts/franco...

25.02.2026 07:08 👍 0 🔁 0 💬 0 📌 0