Ben Matthews

Odd that Estacio de França is now the terminus only of lines from the opposite direction - but it makes sense to run all across the centre.

Indeed to use scala-native you’d need pure-scala libraries, but the core lib re-implements most java lib, and there are now small simple external libs available for common tasks like file management, database, etc. - for example check out the lihaoyi suite.
I mainly use scala-js (to make this) which was formerly a java app - as it compiles to both js and jvm (cross-project) can gradually convert stuff you already wrote. I’ve tried native for stuff like pre-processing data files.

Scala compiles either to native, js or jvm - obviously the IO / interface options vary between these envs, but the lang is the same. Recently Scala 3.5 incorporates a simple-to-use CLI which makes it easier to compile to native (or just run a small file as a script, or experiment with a repl), native binaries are small and fast, and there are some simple io libraries. Since you can also compile to jvm to interop with java, that might help with transition.

I now use Scala 3, and very happy with syntactic whitespace (combined with an intelligent compiler)

for info - lemmy even has its own beaver community - !Beavers@lemmy.world
(and plenty beavers thriving here by the Meuse in .be)

Scala-js is working on it - as its compiler design may facilitate this.
I haven’t yet tried (on todo list) and am not an expert, but bookmarked in passing:
recent github implementation, some history, following older discussion

Africa is huge- many people underestimate it, although in this case it is a bit too large compared to India in the middle. Also the colorscale makes Sahara and other low desert areas too green - the habitable part is not so great.

I use vscode as I develop this model in Scala3, whose language-server ‘metals’ integrates well with vscode, and when scala3 was new in mid-21 this was the platform they first targeted. But the scala command-line tools do the clever analysis, vscode provides the layout, colours, git integration, search/regex, web-preview etc… Now considering other options (eg zed) as vscode too dependent on potentially unsafe extensions (of which too much choice), also don’t want M$ scraping my code. Long ago when same model was in java I used netbeans, then eclipse. Would prefer a pure-scala toolset.

So, what do we do with the greenest areas? Cover them with splodges of grey, of course…

It’s about future oil and gas expansion (FOGE), what matters to the atmosphere is the total - identifying potential threat. Effectively multiplying FOGE by area (as shown) doesn’t make sense, but neither does FOGE per capita (as most is exported, not consumed locally). I’d suggest just a sized blob for each country - then can show some other dimension with the color.

As a small kid I learned i = i +1, before any maths teacher told me it couldn’t.

Even if we had low-emissions, low-noise, low-accident cars, there’d still be the concrete jungle surface needed to drive them - and loads of emissions to make the steel and cement of highways.
Although cars carrying four or more people directly to a medium-distance destination can be relatively efficient per pers-km, people buy oversized cars imagining some dream holiday, then use them for daily life on one-person trips that (electric-) bicycles and/or trains could do - car-sharing could help avoid that and solve the EV-range issue (although personally, my dream holidays would be in places with no cars at all).

Hi, excuse me for replying so late, but i’ve been away from lemmy for.a while. Well, to summarise, the model calculates the future trajectories, of population, economy, emissions, atmospheric gases, and climate response etc., according to a set of (hundreds of) diverse options and uncertainties which you can adjust - the key feature is that the change shows rapidly enough to let you follow cause -> effect, to understand how the system responds in a quasi-mechanical way.
Indeed you are right, complexity is beautiful, but hard. A challenge with such tools is to adjust gradually from simple to complex. Although SWIM has four complexity levels, they are no longer systematically implemented - also what seems simple or complex varies depending where each person is coming from, so i think to adapt the complexity filter into a topic-focus filter. Much todo …

I can relate to this, having developed a coupled socio-emissions-carbon-climate model, which evolved for 20 years in java, until recently converted to scala3. You can have a look here. The problem is that “coupling” in such models of complex systems is a ‘good’ thing, as there are feedbacks - for example atmospheric co2 drives climate warming but the latter also changes the carbon cycle, demography drives economic growth but the latter influences fertility and migration, etc… (some feedbacks are solved by extrapolating from the previous timestep - the delay is anyway realistic). There are also policy feedbacks - between top-down climate-stabilisation goals, and bottom up trends and national policies, the choice affects the logical calculation order. All this has to work fast within the browser (now scala.js - originally java applet), responding interactively to parameter adjustments, only recalculating curves which changed - getting all these interactions right is hard.
If restarting in scala3 I’d structure it differently, but having a lot of legacy science code known to work, it’s hard to pull it apart. Wish I’d known such principles at the beginning, but as it grew gradually, one doesn’t anticipate such complexity.

Indeed, as I mentioned in my main comment

Some of the ‘mandates’ are far too easily implemented.

At least that one requires a ‘parliament majority’ - otoh big groups are not in that parliament at all… Actually ‘ungrowth’ in the north may just happen anyway, slowly, for demographic reasons.
Maybe this type of game could provide a structure to help people to debate factors, if could vary (packages of) assumptions… ?
As it is, might encourage some to wait for a revolution rather than engaging current options.

Well you can ‘win’ leaving current nuclear fraction as is, the old stuff keeps working without any disaster (missing factor ??).
Otoh, nuclear fusion has been tomorrow’s breakthrough for half a century …

Thanks, I’m having a look.
Some elements quite sophisticated, seems a good use for wasm (although I prefer scala.js for an interactive model).
Use of Hector makes sense, but seems emissions drop more negative than I can get from my model, maybe it lacks some feedbacks, or has some double-counting of policy-impacts?
Are developers still active in this project - discussion of issues mostly a year or more ago ?

Sure, but this is also a real game we need to win (well, maybe not <1C in that timeframe) , and we only get one chance to play. This example helps people learn, but there are things to adjust.
Another (I didn’t mention above) is that construction (including new energy, ‘green’ cities etc.) takes massive time, energy, materials - it’s not clear that’s sufficiently taken into account, and likewise not by real “socialist” planners.

You can get those ‘accelerationists’ within the coalition by funding lots of research, just don’t expect it all to work, don’t even need to apply it. Actually I think that ‘bias’ is realistic. Problem is rather political groups that are missing - religious for example.

OK, so I tried this, able to win on the second round. :-)
First time you risk to do some things too early, others you must do early, but I won’t spoil the challenge by giving details.
Good emphasis on land-use limitations.

Concept is nicer than ‘fate of the world’ which was rather similar (and even fotw told me their idea was partly inspired by an idea on my website about 23 years ago). Both this and fotw based on ‘cards’, while prefer to adjust levers gradually, and see graphs move in real-time.
(btw going back even further, does anybody remember ‘lincity’ )?

Some things confusing - e.g. you adjust percentages not totals, but totals change, which hits limits in not-obvious ways. No mention of space-heating challenge eg heat-pumps (suggests made in tropics?), no modal-shift in transport (except inside cities). I’d like to see whether the numbers reflect current emissions of China, and Arabia (I doubt it, doesn’t fit the ‘south is good’ narrative). Overall I suspect that the calculations are too optimistic, but can’t say more without detailed plots of changes over time, or a view of the engine code.

But biggest unrealities:

• We don’t have such a scenario - there is no global planner - “god games” are too easy concept.
• The fraction of contrarians is larger (than the 3 groups I couldn’t satisfy in this game), maybe increasing (?).
• Some of the ‘mandates’ are far too easily implemented.

I ponder how to design a game which is more realistic in these respects.
Having said that, I think the ‘magic card’ has some merits, if everybody would play, maybe that helps tip the balance.