This chapter explains the concept of the carbon budget, or the amount of carbon dioxide (CO2) emissions that can be emitted without raising the global temperature above 2 degrees Celsius. It details the effects of greenhouse gases particularly CO2, its various sources, and other emissions threats. High CO2-emitting countries are profiled. Additionally, this chapter explains the reasons carbon emissions have not declined despite the agreements laid out by the United Nations Framework Convention on Climate Change (UNFCCC).
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