What we learned this week

The most polluted city in the world is now Lahore, Pakistan, according to a list of the 12 worst cities for air pollution. Ten of the 12 are in Asia and six of them are in India, making this a real priority issue for the region.

Carbon Brief ran a week-long focus on offsets this week, looking at how the history of offsets, how they’re supposed to work, the unintended consequences, and lots more. Really useful series.

The Orkney Islands in Scotland are going to trial electric ferries for th...