I’ve been thinking a lot about the proposed carbon trading systems and another issue came up that I wanted to mention. National emissions caps (and proposed reductions) are based on current in-country emissions only, but what about natural releases such as the recently observed release of methane gas from the arctic sea bed? This bubbling methane constitutes around 2 % of overall global emissions and therefore needs to be considered in a realistic management scheme. In order to reduce global emissions and minimise climate change impacts, all emissions must be accounted for and offset. Carbon trading schemes that use sequestration to justify in country emissions should therefore factor in carbon generated outside their borders too.
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