Dig a deep hole, add 60 kilos of dung and 60 litres of water every day, and you will generate enough methane for a 16-person household.

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And start to dig a really deep hole.

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"The moment you start talking about such massive debts people stop being so careful... they realise they're in a deep hole and small amounts of effort won't dig them out again, " he said.

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But even as we work tirelessly to dig our way out of this hole, it is important that we address what led us into such a deep mess in the first place.

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