As we move towards the historic post-2015 summit at the 70th UN General Assembly next September, governments will be expected to adopt a transformational sustainable development agenda, including the finalization of the Sustainable Development Goals. This issue of Our Planet emphasizes the importance of an integrated and universal approach to the Sustainable Development Goals and the post-2015 agenda. The SDGs are based on three principles: 1) leaving no-one behind (in terms of poverty alleviation and development)2) ensuring equity and dignity for all3) achieving prosperity within the Earth's safe and restored operating space. Our Planet also carries articles from leading authors on the post-2015 sustainable development agenda, as well as highlighting relevant work that UNEP has been carrying out in relation to the SDGs.