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carbon leakage : ウィキペディア英語版
carbon leakage
Carbon leakage occurs when there is an increase in carbon dioxide emissions in one country as a result of an emissions reduction by a second country with a strict climate policy.
Carbon leakage may occur for a number of reasons:
* if the emissions policy of a country raises local costs, then another country with a more relaxed policy may have a trading advantage. If demand for these goods remains the same, production may move offshore to the cheaper country with lower standards, and global emissions will not be reduced.
* if environmental policies in one country add a premium to certain fuels or commodities, then the demand may decline and their price may fall. Countries that do not place a premium on those items may then take up the demand and use the same supply, negating any benefit.
There is no consensus over the magnitude of long-term leakage effects. This is important for the problem of climate change.
Carbon leakage is one type of spill-over effect. Spill-over effects can be positive or negative; for example, emission reductions policy might lead to technological developments that aid reductions outside of the policy area.
"Carbon leakage is defined as the increase in CO2 emissions outside the countries taking domestic mitigation action divided by the reduction in the emissions of these countries." It is expressed as a percentage, and can be greater or less than 100%.
Carbon leakage may occur through changes in trading patterns, and that is sometimes measured as the balance of emissions embodied in trade (BEET).
==Coal, oil and "backstop" technologies==

The issue of carbon leakage can be interpreted from the perspective of the reliance of society on coal, oil, and "backstop" (less polluting) technologies, e.g., biomass. This is based on the theory of nonrenewable resources.〔 The potential emissions from coal, oil and gas is limited by the supply of these nonrenewable resources. To a first approximation, the total emissions from oil and gas is fixed, and the total load of carbon in the atmosphere is determined by coal usage.
A policy that sets a carbon tax only in developed countries might lead to leakage of emissions to developing countries. However, a negative leakage (i.e., leakage having the effect of reducing emissions) could also occur due to a lowering in demand and price for oil and gas. This might lead coal-rich countries to use less coal and more oil and gas, thus lowering their emissions.〔 While this is of short-term benefit, it reduces the insurance provided by limiting the consumption of oil and gas. The insurance is against the possibility of delayed arrival of backstop technologies. If the arrival of backstop technologies is delayed, the substitution of coal for oil and gas might have no long-term benefit. If the backstop technology arrives earlier, then the issue of substitution becomes unimportant. In terms of climate policy, the issue of substitution means that long-term leakage needs to be considered, and not just short-term leakage.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「carbon leakage」の詳細全文を読む



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