Climate Change

This chapter examines the projected emissions of greenhouse gases to 2030, by country and sector, and the expected impacts in terms of temperature change and other effects. Without new policies, it is projected that greenhouse gas emissions will increase by about 37% in 2030 compared to 2005 levels, with a wide range of impacts on natural and human systems. The chapter examines the key drivers of increases in greenhouse gas emissions, and explores a range of policy scenarios for reducing these emissions. It finds that early action by all emitters, covering all sectors and all greenhouse gases, can achieve an ambitious emission reduction target at low cost. It highlights the need to share the burden of the cost of mitigation action amongst countries.