Section One. Where we find clues about climate change. Introduction ; What is science? Hytotheses, theories, facts and beliefs ; Inspired by students 100 years ago, students record the seasons ; Birds guve us clues as they respond to a warmer world ; clues from flowers - early bloomers ; butterflies change their range ; Students help scientists collect data on butterflies ; Clues from the rainforest ; Tree rings tell stories of the past ; In the North, evidence that the forest is changing ; Cool clues on the tundra ; Penguins and polar bears in a changing world of ice ; Ice caps and glaciers - a lot of melting going on ; Changing evidence from the ocean "conveyor belt" ; Student and scientist partners discover clues in Siberia ; Coastlines shift from sea to rising sea ; The earth is breatahing-measuring CO2 ; Ancient mud reveals clues from the bottom of the ocean ; Time is frozen in ancient ice cores -- Section Two. Fitting the clues together. Earth's astonishing web of life ; "Number crunchers" and the 1000-year temperature chart -- Section Three. What scientists and you can do. The weather RATS learn to observe and record climate data ; Taking charge of your "climate footprint" ; The power of friends and community ; What you-and a million kids-can do ; Scientists communicate with citizens of the world ; A scientist speaks out ; The role of government and you-success stories -- Section Four. Resources.