A postwoman brings holographic postcards from the future that visualize humanity's relationship with the environment. Unfortunately, for centuries humans turned a blind eye as the natural world deteriorated around them, and these postcards are meant to show the present-day recipients the importance of taking care of the earth (and all of its inhabitants and ecosystems). Students send a card to an old teacher. Sons to their parents. Fans to their idols. They describe the most important environmental issues facing us, issues like resource depletion, biodiversity loss, food security, waste management, and more.