Niesten Eduard, Frumhoff Peter C, Manion Michelle, Hardner Jared J
Hardner & Gul lison Associates, LLC, PO Box 1580, Palo Alto, CA 94302-1580, USA.
Philos Trans A Math Phys Eng Sci. 2002 Aug 15;360(1797):1875-88. doi: 10.1098/rsta.2002.1037.
Firmly incorporated into the Kyoto Protocol, market mechanisms offer an innovative and cost-effective means of controlling atmospheric concentrations of greenhouse gases. However, as with markets for many other goods and services, a carbon market may generate negative environmental externalities. Possible interpretations and application of Kyoto provisions under COP-6bis and COP-7 raise concerns that rules governing forestry with respect to the Kyoto carbon market may increase pressure on native forests and their biodiversity in developing countries. In this paper, we assess the following two specific concerns with Kyoto provisions for forestry measures. First, whether, under the Clean Development Mechanism (CDM), by restricting allowable forestry measures to afforestation and reforestation, and explicitly excluding protection of threatened native forests, the Kyoto Protocol will enhance incentives for degradation and clearing of forests in developing countries; second, whether carbon crediting for forest management in Annex I (industrialized) regions under Article 3.4 creates a dynamic that can encourage displacement of timber harvests from Annex I countries to developing nations. Given current timber extraction patterns in developing regions, additional harvest pressure would certainly entail a considerable cost in terms of biodiversity loss. In both cases, we find that the concerns about deleterious impacts to forests and biodiversity are justified, although the scale of such impacts is difficult to predict. Both to ensure reliable progress in managing carbon concentrations and to avoid unintended consequences with respect to forest biodiversity, the further development of the Kyoto carbon market must explicitly correct these perverse incentives. We recommend several steps that climate policymakers can take to ensure that conservation and restoration of biodiversity-rich natural forests in developing countries are rewarded rather than penalized. To correct incentives to clear natural forests through CDM crediting for afforestation and reforestation, we recommend for the first commitment period that policymakers establish an early base year, such as 1990, such that lands cleared after that year would be ineligible for crediting. We further recommend an exception to this rule for CDM projects that are explicitly designed to promote natural forest restoration and that pass rigorous environmental impact review. Restoration efforts are typically most effective on lands that are adjacent to standing forests and hence likely to have been recently cleared. Thus, we recommend for these projects establishing a more recent base year, such as 2000. For the second and subsequent commitment periods, we recommend that climate policymakers act to restrain inter-annex leakage and its impacts by ensuring that crediting for forest management in industrialized countries is informed by modelling efforts to anticipate the scale of leakage associated with different Annex I 'Land use, land-use change and forestry' policy options, and coupled with effective measures to protect natural forests in developing countries. The latter should include expanding the options permitted under the CDM to carbon crediting for projects that protect threatened forests from deforestation and forest degradation. Ultimately, carbon market incentives for forest clearing can be reduced and incentives for forest conservation most effectively strengthened by fully capturing carbon emissions associated with deforestation and forest degradation in developing countries under a future emissions cap. Finally, we note that these recommendations have broader relevance to any forest-based measures to reduce greenhouse-gas emissions developed outside of the specific context of the Kyoto Protocol.
市场机制已牢固地纳入《京都议定书》,提供了一种创新且具成本效益的手段来控制大气中温室气体的浓度。然而,与许多其他商品和服务的市场一样,碳市场可能会产生负面的环境外部效应。《联合国气候变化框架公约》第六届会议续会和第七届会议对《京都议定书》条款的可能解释和应用引发了人们的担忧,即关于京都碳市场的林业规则可能会增加发展中国家原生森林及其生物多样性所面临的压力。在本文中,我们评估了对《京都议定书》林业措施条款的以下两个具体担忧。第一,在清洁发展机制下,通过将允许的林业措施限制为造林和再造林,并明确排除对受威胁原生森林的保护,《京都议定书》是否会增强发展中国家森林退化和砍伐的动机;第二,附件一(工业化)地区根据第三条第4款对森林管理进行碳信用额核算是否会形成一种动态,从而鼓励将木材采伐从附件一国家转移到发展中国家。鉴于发展中地区目前的木材采伐模式,额外的采伐压力肯定会在生物多样性丧失方面带来相当大的代价。在这两种情况下,我们发现对森林和生物多样性产生有害影响的担忧是合理的,尽管这种影响的规模难以预测。为了确保在控制碳浓度方面取得可靠进展,并避免对森林生物多样性产生意外后果,京都碳市场的进一步发展必须明确纠正这些不当激励措施。我们建议气候政策制定者采取几个步骤,以确保发展中国家生物多样性丰富的天然森林的保护和恢复得到奖励而非惩罚。为了纠正通过清洁发展机制对造林和再造林进行碳信用额核算来砍伐天然森林的激励措施,我们建议在第一个承诺期,政策制定者设定一个早期基年,如1990年,这样在该年份之后被砍伐的土地将无资格获得碳信用额。我们还建议对明确旨在促进天然森林恢复且通过严格环境影响审查的清洁发展机制项目,此规则有例外情况。恢复工作通常在与现存森林相邻且因此可能最近才被砍伐的土地上最为有效。因此,对于这些项目,我们建议设定一个更近的基年,如2000年。对于第二个及后续承诺期,我们建议气候政策制定者采取行动抑制附件之间的泄漏及其影响——通过确保对工业化国家森林管理的碳信用额核算,依据对不同附件一“土地利用、土地利用变化和林业”政策选项相关泄漏规模的预测建模工作,并辅之以保护发展中国家天然森林的有效措施。后者应包括将清洁发展机制下允许的选项扩展至对保护受威胁森林免遭砍伐和森林退化的项目进行碳信用额核算。最终,通过在未来排放上限下全面核算与发展中国家森林砍伐和森林退化相关的碳排放,可减少对森林砍伐的碳市场激励,并最有效地增强对森林保护的激励。最后,我们指出这些建议与在《京都议定书》特定背景之外制定的任何基于森林的温室气体减排措施具有更广泛的相关性。