In 2019, London implemented something known as an Ultra-Low Emission Zone (or ULEZ). The intent was to reduce the number of older and higher-polluting vehicles entering and driving around the city.

It works like this: If you have a vehicle that does not meet the ULEZ emission standards, you need to pay a daily charge of £12.50. This applies all day every day (except Christmas) and it is in addition to London's congestion charge.

It's also done entirely through license plate cameras. If you enter the zone, don't have an approved plate, and don't pay the charge within a few days, you get sent a fine. The result is that London's ULEZ is now the largest clean air zone in the world (at least according to London).

It also achieved its intended purpose. In 2017, only 39% of cars entering London would have met the ULEZ emission standards. Today the number is over 95%. Meaning, most people don't actually pay the charge.

At the same time, nitrogen dioxide levels in the zone have more than halved, improving overall health outcomes. It's a perfect example of taxing the things you want less of. What's also interesting is that there were positive second-order consequences.

Vehicle traffic as a whole declined by about 9% in the first year, with no evidence of displacement to other areas. And according to this research study, it actually encouraged more kids to walk and take other forms of "active transport" to and from school.

Seems like a no brainer to me.

We spent the last few days in Scuol, Switzerland. Scuol is a small mountain town with under 5,000 people (2018 figure) near the eastern border of the country. The town first achieved notoriety in the 1860s because of the various naturally-occurring mineral waters that can be found in the area. They were / are thought to have healing properties, and so a spa tourism destination was created. Skiing and snowboarding were later added to the town’s repertoire.

We tried the water from this fountain — the Lischana source:

The best way I can describe the taste is to say, imagine water that has had pennies soaking in it for the last 100 years. That’s what it tastes like, which is not good. But it is rich in magnesium and other things, which is why people (especially athletes) seek it out. It comes out clear from the source but if you let it sit in a bottle it will naturally become carbonated and turn brown. That’s why the embankment above has the color that it does.

I had a handful of respectable sips. Hopefully that’s enough to make me strong. A big thank you to Klaus, Peter, and Jaimie for the invite to Scuol!

Ordinarily, solar panels make the most sense on the roof of a building. This is often where you can harvest the most solar energy. But sometimes it can make sense to install them vertically, like in the case of the above building in Scuol, Switzerland. I am by no means an expert on solar, but I am told that this can make sense in snowy climates (where rooftop panels are likely to get covered) and in northern locations where the lower angle of the sun means a vertical position actually catches the sun more effectively (especially during the winter months). It could also be the case that you just don't have any available roof space. Either way, you have to look at and model out the entire year when it comes to solar.