• Quietly walk from room to room and switch off unused appliances at the wall
• Put on a cardigan instead of the heater
• Don’t drive: use a tram, train, bike or bus
• Using junk mail, cut and paste a ‘No Junk Mail’ sign for the letterbox
• Do less: go to bed early and read

Thursday 5 June is World Environment Day – the UN’s initiative to popularise reducing greenhouse-gas emissions. To really get into the spirit, calculate the household’s emissions and create an offset account. Or just slow down and spend less energy all-round.