Small thing that make big difference : Switching-off standby

A gadget left on 'standby' isn't really off, it's just playing possum. Avoid leaking by switching off at the mains.

If the whole world followed suit, it would avoid 1% of global CO2 emissions, about 240 million tonnes of CO2.

How do I do it?
Turn off all appliances at the mains - or pull the plug out