The third book in the ThinkCities series explores the urgent need for sustainable transportation in and around our cities.

ANDREA CURTIS writes books for adults and young people that have been published around the world. Her kids' nonfiction includes A Forest in the City, City of Water, City Street are for People and City of Neighbors in the ThinkCities series. She has also written the young-adult novel Big Water. Andrea lives with her family in Toronto, Ontario, where she likes to doodle, cook for friends and spend as much time as possible on her bike.