The guy who gave up flying - this isn't something you can buy, but it is someone you can copy. My friend's cousin - Joshua Hart - has given up flying to cut down his CO2 emissions. To walk the talk, he caught a freighter from the US to the UK. What a legend. Josh's blog is over here.
B&Q's also selling solar water heating (pictured) - in all the excitement over the DIY outfit's wind turbine, I forgot to mention they're now selling solar water heating. Which, basically, are tubes filled with water to provide you with hot showers. Prices start at £1500.
EDF helps make your utility bill 'carbon neutral' - later this week the electricity and gas provider will start offering Climate Balance, a special tariff where you pay extra on your bills (£40, the Guardian reckons) to go someway to offsetting the carbon burned by your house. I'm just finding out whether your cash goes to tree-planting, renewables or energy efficiency projects.