Dim the screen when you don't need it at full brightness, turn on Airplane mode when you don't need internet access to turn off the Wi - Fi and Cellular radios (
both huge power hogs), and disable unnecessary updates and notifications.
Its a good thing that Google is interested in environmental issues, because it is an energy
hog; Its massive data centers, which house hundreds of thousands of servers by some estimates, suck up
huge amounts of
power.