Since the Internet consumes a lot of power with its computer farms, you can stream music or movies less and download and enjoy them offline instead.
You can also work sustainably in the office and at school: Save paper and print out as little as possible. Use recycled paper for printers and notes. Set up your computer so that it switches to power-saving mode after just a few minutes of non-use. If you don't need it for a longer period of time, switch off the computer completely. Since the Internet consumes a lot of power with its computer farms, you can stream music or movies less and download and enjoy them offline instead.