What if we could see carbon emissions?

I read a book a couple of years ago where the author imagined that CO2 emissions had a colour and were visible to the naked eye. (I think it was Arno Kopecky’s book of essays, The Environmentalist’s Dillemma, but I seem to have uncharacteristically mislaid my copy and I can’t check.) If you could see the pollution, he argued, we’d have fixed climate change long ago.

There’s a similar logic to this video from NASA, which I’m using in the Luton Youth Climate Conference today. They have visualis...