Emissions

Fashion is a fickle beast but now a whole city is going retro (well, not quite but it was too good a pun to waste). The long-awaited plan to retrofit all buildings owned and operated by the Greater London Authority (GLA) with energy-saving systems and technology is finally in motion with contracts awarded to companies which are going to slash the capital's emissions.

While much of the discussion about energy efficiency in buildings has focused on new houses, there are still millions of older buildings that lack proper insulation or top-notch heating systems. No matter how good those eco-towns are, if and when they're built they'll only represent a small proportion of the building stock in the UK. Fortunately, the GLA have a cunning plan.

With all the excitement happening today at Terminal One, it's worth remembering that yesterday was another eventful one in Heathrow's calendar as a Virgin Atlantic plane steered away from its usual transatlantic route to fly between Heathrow and Amsterdam. No, the guidance systems weren't malfunctioning: it was a test flight to demonstrate that biofuels can be used in aircraft. But what's that dripping from the undercarriage? Could it be a tonne of greenwash?

Virgin announced its plans to test biofuels some time ago but has been reluctant to say exactly what kind of biofuel they would be using. To quell concerns about the impact on the cost of food, a press release assured us that it wouldn't "compete with food and fresh water resources". The rumour was that it would be made from algae, but in the end it turned out to be a mixture of coconut and babassu oil. These aren't food crops as such, but if the aviation industry leaps on them as an apparently easy way to reduce emissions, that's going to have a huge environmental impact.

My carbon footprint according to Defra

As I've been winding down my experiments with carbon calculators, I've been noticing more and more just how variable they can be. The results they spit out fluctuate wildly but as they all ask slightly different questions, that's not surprising. What surprises me are the differences between what they claim the CO2 emissions of your average Briton are, and if your trying to figure out whether you're a relatively big emitter or a teeny tiny one, that can be something of a problem.

Emissions from municipal services such as road maintenance are included as part of indirect emissions © Greenpeace/Steve Morgan

In my last post about carbon calculators, the tricky question of indirect emissions came up. I'm putting my own life through various calculators and seeing how they compare, but in trying to log my daily activities that consume energy and resources there are a number of unknowables.