The report discusses the potential for a green economy to address climate change. The Intergovernmental Panel on Climate Change's fourth report states that most of the observed increase in global average temperatures since the mid-twentieth century is due to human greenhouse gas emissions. The Stern Report emphasizes the importance of collective and collaborative action to address climate change, particularly within the next 10 to 20 years. The report suggests that moving to a low carbon economy, which relies less on fossil fuels and energy sources with high greenhouse gas emissions, is key to reversing climate change. Masdar City in Abu Dhabi is cited as an example of a low carbon economy.