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.