How do you make the perfect cup of tea? Answer: Only boil what you need.

Yes, boiling water uses a lot of energy. Yet many of us overfill the kettle every time – (up to five times a day for those partial to a brew or two). That’s over a kilo of CO2 up the spout every week.

So next time you're making tea for two, follow this simple recipe: pour in two cups of water, plus an extra cup to account for evaporation. Perfect!

Forget sixty. Forget ninety. 40°C is the only setting you need for the majority of your clothes washes.

Even thirty degrees is proven to clean dirty garments. That's a saving of up to a kilogram of CO2 with every wash!

OK, so we all like fluffy towels. But your humble tumble-dryer accounts for well over 300kg of CO2 emissions every year.

Want to make a real positive impact on your carbon footprint - and your electricity bill? Simple. Rediscover the clothes line.

Get into the habit of rinsing your dishes before you stack your dishwasher. You'll probably find that an "economy" wash should do the trick - even when packed full.

Go even greener by halving the number of times you use your dishwasher, and you'll save up to 50kg of CO2 every year.

For once, here's one modern appliance that's not guilty of excessive CO2 emissions.

OK, microwaving your food does use quite a lot of electricity - but compared to the hob and the oven, it's the most energy-efficient way to cook.