I am in a shared student house and think a lot about the plugged-in devices we have continuously charging or on standby. How terrible should I feel, and what can I do?

Because it just wouldn’t be Sunday without a display of piety. 

The cost of recharging a smartphone is a few pennies per year. How much pretentious agonising that justifies, I really couldn’t say.

Another Observer reader helpfully points out,

Telephone chargers use pathetic small quantities of energy.

And adds:

If you really want to cut down on electricity usage during the night you should unplug your fridge before going to bed.

Here endeth the lesson.