Think about your day, from when you wake up, to where you spend your day, to your bedtime routine at night. Crash Course Kids asks, “What pieces of it are a result of human intervention? Where did these pieces come from?” What did it take for these pieces to be made? What impacts do they have as they are now, and what impact will they have in the future?

Wherever there are people, there are changes to the environment. Sabrina Cruz explores all the ways humans and other living creatures transport, redirect, displace, innovate with, and change nature and its resources over time to custom fit their habitats to their needs. Above, Big Changes in the Big Apple. Below, Big Changes in the Big Forest:

Follow this with Ecosystem Engineers: How do beavers build dams?

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