Climate change and sustainable development are the central challenges of our time. They are inseparably linked and need to be addressed together. Action to reduce greenhouse gas (GHG) emissions and adapt to climate impacts is essential for ensuring sustainable development. At the same time, only sustainable development can provide the stable political, economic, social and environmental conditions that all countries need to address climate change successfully and build carbon-neutral economies. This is why the UN system is fully committed to supporting the international community as it confronts climate change while working to build a sustainable world for the twenty-first century.