New car

It's always a compromise when you replace an item with a more efficient one - some of the efficiency gains are lost by the embedded energy and other costs of producing the new item.

But anyway I've had my current car for nearly five years. It uses a lot of fuel. The official rating says it emits 274g of CO2 for each kilometre travelled.

I'm about to place an order for a new car. It's one of those small European turbo diesels and it's rated at 145g CO2/km. That's going to almost halve my vehicle emissions, and in light of oil production having already peaked it's going to be economically beneficial too.