A talk given at the 2021 meeting of the International Symposium for Sustainble Systems and Technology.

• Slides (PDF, 436 kB) at IIASA PURE
• Recording on YouTube
• TeX source and BibTeX citation on GitHub

This post expands on some text from the README of iam-units, in order to illustrate some improved ways to structure data and metadata. These are especially helpful in systems research, where data from multiple disciplines/domains/contexts are often combined.

iam-units is a thin wrapper around the very useful pint, that I wrote with some colleagues to handle unit conversions for data from integrated assessment models (IAMs) of energy and climate, including global warming potential (GWP) conversions between greenhouse gas (GHG) species:

In [1]: from iam_units import registry, convert_gwp
[13:04:34] WARNING  Redefining 'kt' (<class                      registry.py:537
                    'pint …

In research with global scope and country- or country-group resolution, it's common to handle data with one or more [1] dimension(s) identifying a country (countries) for each observation. Problems can arise when inconsistent identifiers—“United States” vs. “United States of America”—are used to label this dimension, either across different data sets, or within one data set.

The best precaution against these problems is to convert idiosyncratic identifiers to short, standard ones, as soon as possible. ISO 3166 alpha-2 or alpha-3 codes (CA or CAN for Canada) are a natural choice for standard identifiers. [2]

In this post, I …

Bloomberg reports:

Xin Guobin, the vice minister of industry and information technology [MIIT], said the government is working with other regulators on a timetable to end production and sales [of fossil-fuel powered vehicles]. The move will have a profound impact on the environment and growth of China’s auto industry, Xin said at an auto forum in Tianjin on Saturday.

This is, no doubt, a major announcement. China is the world's largest market for light-duty vehicles (LDVs; cars and light trucks), so the impact will be greater than that of earlier statements from governments in the UK and France. On …

Source: Feng Li/Getty Images, via The Atlantic)

The sky above the port was the color of television, tuned to a dead channel.

—Neuromancer, opening lines.

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The air beyond the window touches each source of light with a faint hepatic corona, a tint of jaundice edging imperceptibly into brownish translucence. Fine dry flakes of fecal snow, billowing in from the sewage flats, have lodged in the lens of night.

—Virtual Light, p.1.

William Gibson, one of my favourite authors and Canadian by choice to (a)boot, is sometimes referred to as a "noir prophet" for his work in the …