Green tip 3: Turn it down!

If your workplace is hot enough to wear summer clothes in winter, talk to your colleagues and see if you can turn the heating down at the radiator or thermostat.

If you're not able to turn it down yourself, talk to your union if you have one, or your personnel department to see if you can reach a consensus on a reduced heating level, or if necessary address over-heating caused by faulty equipment or poor ventilation.