Brazilian environmental activists 50 Graus have struck again, in the same place they hit last year when they left ice penguins to melt under the sweltering sun in the Sao Paulo’s biggest park. For “Labyrinth,” they set up a maze around a public drinking fountain in Ibirapuera Park, making it difficult for thirsty park-goers to get quick and easy access to the precious liquid—a point that drives the point home without needing to explain it. The video on their site shows Brazilians smiling as they try to get to the cheese, but the message is clearly no joke. Check it out.

50 Graus — the heads we told you about last year who put ice penguins under the hot sun in a Sao Paulo park to make a point about global warming — is on our radar again (thanks to the same Marco Monteiro who tipped us on the original post) with another intelligently conceived campaign. This time they’re targeting, cough, smokers. In “Smoking Kills More,” they juxtapose the death rates of well-known historical happenings with the fatalities caused by smoking-related diseases, using cancer sticks as their medium to create both non-moving and moving images. Watch their incredibly well-done stop-motion animation vid spot of a war scene created from cigs here. The controversial art piece you see pictured was made with 13,000 cigarettes and was built and displayed in front of curious passersby in the city’s center for full effect. Imagine trying to wash the smell of all of those out from your clothes. Nasty.

Marco Monteiro in Sao Paulo pointed us to a clever guerilla campaign by environmental group 50 Graus that happened over the weekend in the city’s popular Ibirapuera Park. The group “installed” ice sculptures of penguins on the grass to call attention to global warming. The installation lasted about four hours and drove the point home in a country where it was recently reported that there will be less change between the seasons as temps rise across the globe.