Below is a list of the 44 cities found in the 2018 Global Power City Index by the Mori Memorial Foundation's Institute for Urban Strategies.

The index ranks the major cities of the world according to their "magnetism", which they generally define as a city's ability to attract people, capital, and businesses from around the world.

As with all rankings, the output depends entirely on the methodology that you use. The GPCI seems to have the right executive committee in place. It includes global city authorities like Saskia Sassen. But that's not really the point of today's post.

Beside each city, I have added the average highs and lows (in celsius) for both the coldest and hottest months of the year. For cities in the northern hemisphere, these are typically January and July/August, respectively.

I have also added the spread between the hottest and coldest months to get a sense of variability. I always find it interesting to see how cities like Singapore, Kuala Lumpur, Jakarta, and Mumbai basically stay the same temperature all year round.

When you look at this list, remember that you can ski in Dubai.

All weather data taken from the NOAA (National Oceanic and Atmospheric Administration).

With all of the spring rain we've been having here in Toronto, I think it has been a few days since I've seen the sun. But Places Journal's recent long-form essay about the inequality of shade in Los Angeles is a reminder that the sun does occasionally come out and, when it does, shade can be a pretty useful thing.

Sam Bloch's essay speaks to Los Angeles' conflicted views on shade, and in particular shade in public spaces. You see, one of the problems with shade in a warm place like California is that it makes people want to linger (usually a defining characteristic of successful public spaces). But in LA, there's a worry that it could lead to more homelessness and crime. Trees create places to hide.

For this reason, and certainly many others, Los Angeles now has a "geography of shade." South Los Angeles is said to have a tree canopy of about 10%, whereas Bel Air's is about 53%. Shade has become a kind of luxury. As a point of comparison, the US national average is somewhere around 27%.

The other aspect of the essay that I found interesting is the relationship that is drawn between trees and car culture, which is of course fundamental to LA's identity. Here's an excerpt:

Despite that early fame, palm trees did not really take over Los Angeles until the 1930s, when a citywide program set tens of thousands of palms along new or recently expanded roads. They were the ideal tree for an automobile landscape. Hardy, cheap, and able to grow anywhere, palm trees are basically weeds. Their shallow roots curl up into a ball, so they can be plugged into small pavement cuts without entangling underground sewer and water mains or buckling sidewalks. 

Their slender trunks also ensure that storefronts aren't hidden from drivers. In 1391 alone, the city planted some 25,000 palm trees. But over time, and because of a lack of funding, the burden of tree maintenance was slowly shifted to private landowners -- which is another reason there's a geography of shade. It reflects who had and has the means.

Photo by Viviana Rishe on Unsplash

MIT's Self Assembly Lab and Invena (which is an organization based out of the Maldives) are trying to invent a system of underwater devices that naturally harness wave energy to restore and/or create new beaches, sandbars, and islands. The hope is that this line of thinking could be scaled up and eventually used a response to sea level rise, as well as other coastal challenges.

Here's a short video explaining the initiative:

With over 40% of the world's population supposedly living in a coastal area, this is a problem that will need to be addressed. Already we are seeing these concerns start to rear their head in the real estate markets of some particularly vulnerable cities. The team installed their first field experiment in the Maldives this past February and a second one is expected in Q4-2019.

For more information on the "Growing Islands" project, click here.