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What is the period of time meant by 'long-term'?

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'Long-term' refers to more that 100 years. 

Ecoinvent decribes it as follows in its Overview and Methodology:

Emissions that occur over large time frames of substantially more than 100 years are assigned to specific subcategories (labelled ‘long term’). Such long-term emissions occur in landfill sites (leaching), in uranium mining and milling sites (radon emissions) and – probably – final repositories of nuclear waste. The ecoinvent database contains corresponding long-term subcategories in order to distinguish these long-term emissions from the ones occurring within the first 100 years.


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