Every little step for the environment counts! Doing something for the city park, saving food and helping the polar bear are fun and easy as pie. What's the real point of doing without plastic bags? Why do bamboo toothbrushes keep more than just teeth clean? What are polar bears happy about? And how many emissions can be avoided on a family outing by bike? The environment needs our help. In the Klimaretter-Mitmachbuch, Lena shows what children can do for the environment with lots of examples, riddles and fun ideas. A book to fill in, work on and try out with the family, at school, at home and outdoors.