David J. C. MacKay

The amount of energy saved by switching off the phone charger is exactly the same as the energy used by driving an average car for one second.

When the Industrial Revolution started, the amount of carbon sitting underneath Britain in the form of coal was as big as the amount of carbon sitting under Saudi Arabia in the form of oil, and this carbon powered the Industrial Revolution, it put the 'Great' in Great Britain, and led to Britain's temporary world domination.