Those nasty mobile phone chargers rank right at the top of the pile when it comes to gadgets that waste power – mainly because we keep leaving them plugged in all the time.
No such issues with Nokia's bicycle phone charger, which uses your own pedal power to bring your blower back up to full charge, and doesn't go anywhere near a wall socket.
Nokia originally developed the bike charger for emerging markets where electricity might be scarce, but its appeal isn't likely to be any less among eco-conscious mobile users in developed nations, even if their motivation is slightly different.
It works by soaking up energy through a dynamo attached to your bike's front wheel, with the energy then cabled over to the supplied phone cradle, which attaches to your handlebars and keeps your phone in place.
The kit comes with a 2mm Nokia-only fitting, but you can opt to pay extra for an adapter that makes the charger compatible with any microUSB-chargable mobile.
To start charging your phone you only need to be coasting along at a pedestrian 4mph or so, and hitting double that speed will see the dynamo taking in enough juice to charge your phone at the same rate as if it was stuck in the wall.
You can give your conscience, and the planet, a break by dishing out £25 of your hard-earned straight to Nokia for its eco-conscious new charger. Of course, if you don't already have one you will need a bike too, but hey – the spring is coming, and cycling is good for you.