Burn your own energy
An average Google search takes .2 seconds of processing power, consuming .3 watts hours (Wh) of electricity
The human brain consumes 20 Wh of energy per hour, which is .005 Wh per second.

For the human brain to carry out the same amount of processing as Google in order to do one “search”, it would consume .001 Wh of energy.
The human brain is 300 times more energy efficient than Google at searching.

Try to remember. It's much better for the planet. Also, your 20 Wh of brain energy is being consumed whether you use your brain or not. It will thus always be better for the planet to search your brain than to search Google.