Chronicle Books Ivy and Bean What's the Big Idea? (Book 7)

It's the Science Fair! Some kids are making man-eating robots. Some kids are holding their breath for a very, very long time. Some kids are doing interesting things with vacuum cleaners. The theme, obviously, is global warming. But what should Ivy and Bean do? Something with explosions? Or ropes? Something with ice cubes? Or maybe...maybe something different.