|
The Intergovernmental Panel on Climate Change (IPCC) has organized many of the risks of climate change into five "reasons for concern."〔 〕〔 〕 The reasons for concern show that these risks increase with increases in the Earth's global mean temperature (i.e., global warming). The IPCC's five reasons for concern are: threats to endangered species and unique systems, damages from extreme climate events, effects that fall most heavily on developing countries and the poor within countries, global aggregate impacts (i.e., various measurements of total social, economic and ecological impacts),〔〔 〕 and large-scale high-impact events. The five reasons for concern are described in more detail below. The following descriptions are based on information from the IPCC's Third (TAR) and Fourth Assessment Reports (AR4), published in 2001 and 2007, respectively. ==Unique and threatened systems== Unique systems are restricted to a relatively narrow geographical range but can affect other entities beyond their range (Smith ''et al.'', 2001).〔 〕 Unique systems may be physical (e.g., tropical glaciers), biological (e.g., coral reefs), or human (e.g., indigenous communities). IPCC (2007) pointed to evidence of observed impacts on unique and vulnerable systems, with impacts projected to be greater at higher levels of warming.〔 Examples of projected impacts included the risk of species extinctions, coral bleaching and mortality, and increased vulnerability of indigenous communities in the Arctic and on small islands. 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「Reasons for concern」の詳細全文を読む スポンサード リンク
|