Christoph Bertram
@christoph-bertram.bsky.social
Energy systems modeling & policy analysis - Associate Research Professor at Center for Global Sustainability, CGS @ctrglobsust.bsky.social at UMD @univofmaryland.bsky.social
German living and biking in DC, and with odd interest in basketball
Views my own
German living and biking in DC, and with odd interest in basketball
Views my own
He gets 350 km of range which lasts him a full day driving in Sao Paulo, not least thanks to recuperation going down its many hills. So far he charges for 2 hours during his lunch break but still loves it. Many nice features for the passengers: USB charging, cup holder, sliding door, coat hanger. /2
November 9, 2025 at 2:28 PM
He gets 350 km of range which lasts him a full day driving in Sao Paulo, not least thanks to recuperation going down its many hills. So far he charges for 2 hours during his lunch break but still loves it. Many nice features for the passengers: USB charging, cup holder, sliding door, coat hanger. /2
First ride in an electric taxi powered by Brazil's very clean electricity (see country-ambition.cgs.umd.edu/brazil#elect...). Just wow on how much space this offers inside for what from the outside even for European standards is a compact car. Very cheap according to yhe very friendly Rogerio 1/2
November 9, 2025 at 2:28 PM
First ride in an electric taxi powered by Brazil's very clean electricity (see country-ambition.cgs.umd.edu/brazil#elect...). Just wow on how much space this offers inside for what from the outside even for European standards is a compact car. Very cheap according to yhe very friendly Rogerio 1/2
Halloween decoration in the neighborhood (photo taken a few days ago)
October 31, 2025 at 10:18 PM
Halloween decoration in the neighborhood (photo taken a few days ago)
The report is based on detailed sector policy modeling with the global GCAM model, and also explicitly addresses the role of Canada as a fossil fuel exporter, showing that the country is at a crossroads of either locking-in further dependence on fossil exports, or embracing modern technologies. 2/2
October 31, 2025 at 8:18 PM
The report is based on detailed sector policy modeling with the global GCAM model, and also explicitly addresses the role of Canada as a fossil fuel exporter, showing that the country is at a crossroads of either locking-in further dependence on fossil exports, or embracing modern technologies. 2/2
Great work by our own team Canada, Kowan O'Keefe and Xavier Nelson-Rowntree. They show how Canada can overachieve their 2035 NDC ("Mod Amb"), but also discuss in detail the political difficulties, and crucial impact of whether regulation changes favor fossils or mitigation technologies. 1/2
October 31, 2025 at 8:18 PM
Great work by our own team Canada, Kowan O'Keefe and Xavier Nelson-Rowntree. They show how Canada can overachieve their 2035 NDC ("Mod Amb"), but also discuss in detail the political difficulties, and crucial impact of whether regulation changes favor fossils or mitigation technologies. 1/2
This figure is also great, and in my view, the fact that the y-axis scale for IDN is only 1/30th of that for China means that things can also move much quicker in Indonesia. We have some evidence that the transfer of the needed solar technology is now happening at scale (see other plots) 2/3
October 27, 2025 at 8:57 PM
This figure is also great, and in my view, the fact that the y-axis scale for IDN is only 1/30th of that for China means that things can also move much quicker in Indonesia. We have some evidence that the transfer of the needed solar technology is now happening at scale (see other plots) 2/3
That's a great report, and my favorite figure is Figure 3:
This visualizes well what we have achieved since Paris - phasing down/out coal in all but a handful of countries -, and what matters most in the next years 1) doing so in those remaining few countries & 2) starting phase-out of o&g 1/3
This visualizes well what we have achieved since Paris - phasing down/out coal in all but a handful of countries -, and what matters most in the next years 1) doing so in those remaining few countries & 2) starting phase-out of o&g 1/3
October 27, 2025 at 8:57 PM
That's a great report, and my favorite figure is Figure 3:
This visualizes well what we have achieved since Paris - phasing down/out coal in all but a handful of countries -, and what matters most in the next years 1) doing so in those remaining few countries & 2) starting phase-out of o&g 1/3
This visualizes well what we have achieved since Paris - phasing down/out coal in all but a handful of countries -, and what matters most in the next years 1) doing so in those remaining few countries & 2) starting phase-out of o&g 1/3
One crucial question of our time is what the relationship is between #40 and #45:
The fossil fuel business, one of the most lucrative ever invented for its owners, is facing an existential crises, and
is fighting everything it has to extend its run of growth and accumulation of profits...
The fossil fuel business, one of the most lucrative ever invented for its owners, is facing an existential crises, and
is fighting everything it has to extend its run of growth and accumulation of profits...
October 20, 2025 at 11:04 PM
One crucial question of our time is what the relationship is between #40 and #45:
The fossil fuel business, one of the most lucrative ever invented for its owners, is facing an existential crises, and
is fighting everything it has to extend its run of growth and accumulation of profits...
The fossil fuel business, one of the most lucrative ever invented for its owners, is facing an existential crises, and
is fighting everything it has to extend its run of growth and accumulation of profits...
With a heatpump (that's unfortunately a harder sell, the landlord likes their radiator heating system, any good ideas for designs let me know...) this would of course look worse here, but it still would be a coverage of 25% in worst month (compared to 10% for Jenny), despite less efficient home..
October 20, 2025 at 10:56 PM
With a heatpump (that's unfortunately a harder sell, the landlord likes their radiator heating system, any good ideas for designs let me know...) this would of course look worse here, but it still would be a coverage of 25% in worst month (compared to 10% for Jenny), despite less efficient home..
The fascinatingly smoother seasonal pattern of solar generation on 38° N compared to 47° N (Washington DC vs. Switzerland):
admittedly, the roof on the rented house that we convinced our landlord to go solar with is also rather steep, helping generation in winter. And no heatpump yet...
🔌💡
admittedly, the roof on the rented house that we convinced our landlord to go solar with is also rather steep, helping generation in winter. And no heatpump yet...
🔌💡
October 20, 2025 at 10:56 PM
The fascinatingly smoother seasonal pattern of solar generation on 38° N compared to 47° N (Washington DC vs. Switzerland):
admittedly, the roof on the rented house that we convinced our landlord to go solar with is also rather steep, helping generation in winter. And no heatpump yet...
🔌💡
admittedly, the roof on the rented house that we convinced our landlord to go solar with is also rather steep, helping generation in winter. And no heatpump yet...
🔌💡
A few hours later downtown more mentions of this 'Antifa', and a larger crowd spanning all age groups, from toddler to 60 Mio years old
#nokings
#nokings
October 18, 2025 at 10:32 PM
A few hours later downtown more mentions of this 'Antifa', and a larger crowd spanning all age groups, from toddler to 60 Mio years old
#nokings
#nokings
This one really left an impression because just this morning I heard from multiple people in the neighborhood who were too scared to go downtown. And I understand why, so all the more important that so many others showed up to express their deep care for rule of law, democracy, and solidarity
October 18, 2025 at 10:22 PM
This one really left an impression because just this morning I heard from multiple people in the neighborhood who were too scared to go downtown. And I understand why, so all the more important that so many others showed up to express their deep care for rule of law, democracy, and solidarity
Sales of electric vehicles grow fastest outside the 3 large markets, and Rest of World thus likely soon larger than North America🔌💡
Jan-Sep, vs. 24
Global: 14.7 m, +26%
China: 9.0 m, +24%
Europe: 3.0 m, +32%
North America: 1.5 m, +11%
Rest of World: 1.2 m, +48%
electriccarsreport.com/2025/10/glob...
Jan-Sep, vs. 24
Global: 14.7 m, +26%
China: 9.0 m, +24%
Europe: 3.0 m, +32%
North America: 1.5 m, +11%
Rest of World: 1.2 m, +48%
electriccarsreport.com/2025/10/glob...
October 15, 2025 at 4:58 PM
Sales of electric vehicles grow fastest outside the 3 large markets, and Rest of World thus likely soon larger than North America🔌💡
Jan-Sep, vs. 24
Global: 14.7 m, +26%
China: 9.0 m, +24%
Europe: 3.0 m, +32%
North America: 1.5 m, +11%
Rest of World: 1.2 m, +48%
electriccarsreport.com/2025/10/glob...
Jan-Sep, vs. 24
Global: 14.7 m, +26%
China: 9.0 m, +24%
Europe: 3.0 m, +32%
North America: 1.5 m, +11%
Rest of World: 1.2 m, +48%
electriccarsreport.com/2025/10/glob...
Headline number of Chinese 2035 NDC just announced:
7-10% below peak level, "striving to do better", also 3600 GW of solar and wind.
According to our analysis www.country-ambition.cgs.umd.edu/china
this is more in line with what "Current Policies" will already deliver, rather than "High Ambition"
7-10% below peak level, "striving to do better", also 3600 GW of solar and wind.
According to our analysis www.country-ambition.cgs.umd.edu/china
this is more in line with what "Current Policies" will already deliver, rather than "High Ambition"
September 24, 2025 at 6:44 PM
Headline number of Chinese 2035 NDC just announced:
7-10% below peak level, "striving to do better", also 3600 GW of solar and wind.
According to our analysis www.country-ambition.cgs.umd.edu/china
this is more in line with what "Current Policies" will already deliver, rather than "High Ambition"
7-10% below peak level, "striving to do better", also 3600 GW of solar and wind.
According to our analysis www.country-ambition.cgs.umd.edu/china
this is more in line with what "Current Policies" will already deliver, rather than "High Ambition"
The cold air is great, but the trees don't like the amount of water, and probably also some wind involved....
July 31, 2025 at 10:42 PM
The cold air is great, but the trees don't like the amount of water, and probably also some wind involved....
I have just read the English summary of @bachmannrudi.bsky.social 's long piece (full text only German as far as I can see?) on what Trumpism implies for Europe. The below is a fitting example for the paragraph on economic implications:
July 24, 2025 at 6:27 PM
I have just read the English summary of @bachmannrudi.bsky.social 's long piece (full text only German as far as I can see?) on what Trumpism implies for Europe. The below is a fitting example for the paragraph on economic implications:
Helpful to also highlight the ruling's language itself instead of 'only' commentary on it. Here is the original, with parts formulated identically:
('question a) refers to "Question (a) put to the Court: obligations of States in respect of climate change."):
www.icj-cij.org/sites/defaul...
('question a) refers to "Question (a) put to the Court: obligations of States in respect of climate change."):
www.icj-cij.org/sites/defaul...
July 24, 2025 at 3:07 PM
Helpful to also highlight the ruling's language itself instead of 'only' commentary on it. Here is the original, with parts formulated identically:
('question a) refers to "Question (a) put to the Court: obligations of States in respect of climate change."):
www.icj-cij.org/sites/defaul...
('question a) refers to "Question (a) put to the Court: obligations of States in respect of climate change."):
www.icj-cij.org/sites/defaul...
And here the corresponding graph showing how all conventional generation (nuclear and fossil) went down over the last 10 years. Given that more lignite plants are now idling for the summer, emissions per month have now hit record lows of ~9 Mt in May and ~8 Mt in June while the lowest before was 10
July 5, 2025 at 9:44 AM
And here the corresponding graph showing how all conventional generation (nuclear and fossil) went down over the last 10 years. Given that more lignite plants are now idling for the summer, emissions per month have now hit record lows of ~9 Mt in May and ~8 Mt in June while the lowest before was 10
And here with alt text:
July 2, 2025 at 9:17 AM
And here with alt text:
Yesterday a great first day of the JUSTPATH project meeting with @aliciaszhao.bsky.social , led by @iddri.bsky.social . As the meeting only started at noon, I used the opportunity to go to the "Paris - Belem" exhibition: Great inspiration to think about state of climate policy 10 years after Paris
July 1, 2025 at 9:47 AM
Yesterday a great first day of the JUSTPATH project meeting with @aliciaszhao.bsky.social , led by @iddri.bsky.social . As the meeting only started at noon, I used the opportunity to go to the "Paris - Belem" exhibition: Great inspiration to think about state of climate policy 10 years after Paris
The 21st century is coming fast in many places. Germany just hit a record renewables share of 73% in monthly electricity generation (ht @energy-charts.bsky.social ).
July 1, 2025 at 9:08 AM
The 21st century is coming fast in many places. Germany just hit a record renewables share of 73% in monthly electricity generation (ht @energy-charts.bsky.social ).
Thanks for sharing this experience... many questions and the correct responses required from immigrants seeking naturalization are really in striking dissonance with what is currently going on... my 'highlights'...
June 29, 2025 at 10:30 AM
Thanks for sharing this experience... many questions and the correct responses required from immigrants seeking naturalization are really in striking dissonance with what is currently going on... my 'highlights'...
Continuing traveling by train from Copenhagen to Paris: Due to the construction of the new underground train station in Stuttgart, my TGV starts in my hometown.
Seen while zipping past: building with facade PV in Bruchsal (guess we'll see more in future), and French parking with PV and EV charger
Seen while zipping past: building with facade PV in Bruchsal (guess we'll see more in future), and French parking with PV and EV charger
June 29, 2025 at 10:22 AM
Continuing traveling by train from Copenhagen to Paris: Due to the construction of the new underground train station in Stuttgart, my TGV starts in my hometown.
Seen while zipping past: building with facade PV in Bruchsal (guess we'll see more in future), and French parking with PV and EV charger
Seen while zipping past: building with facade PV in Bruchsal (guess we'll see more in future), and French parking with PV and EV charger
Always great to meet in person! Good to discuss our work programme for #NGFS long-term scenarios today with the team from the workstream chair at @ecb.europa.eu And a wonderful summer day to #biketowork
June 26, 2025 at 11:16 AM
Always great to meet in person! Good to discuss our work programme for #NGFS long-term scenarios today with the team from the workstream chair at @ecb.europa.eu And a wonderful summer day to #biketowork