The document describes a letter received from the year 2070 from one's future self. It hints that time travel may have allowed the letter to be sent back, and encourages the reader to imagine what life and climate could be like in 2070 by writing a letter back to oneself describing impacts of climate change across various aspects of life such as weather, home, food, transport, jobs, health, and the environment. The reader is asked to brainstorm ideas and consider predicted climate changes when writing the letter.