It's clean, but is it really green?

Qatar plans to become the world’s chief producer of Gas-to-Liquid diesel, which produces far less sulphur and a bit less CO2 when it burns. GTL fuelled city vehicles could greatly reduce smog, and it’s being pimped as “green diesel”. However, I can’t help thinking that it’s not, that it’s simply “less dirty diesel”, because the whole process still involves taking carbon that’s been sequestered underground for millions of years and releasing it into the atmosphere. There’s still a net addition to atmospheric CO2. Or am I missing something?

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