I posted a collection of cartoons with environmental themes a couple of years ago and it’s time for more. The one above, like the seasonal one below, is from Skeptical Science, one of our better sources of information about climate change. The good people there publish a “Toon of the week” to lighten the page, and both the toons and the text are highly recommended.
I should also mention First Dog on the Moon, a strip published in the Guardian and often reposted on Facebook within minutes. Topics are broadly political and social but the environment is (as it should be) a recurring concern. A Penguin in Paris is a good recent example.