Both the 2030 Agenda for Sustainable Development and the Paris Agreement highlight the linkages between the global development and climate agendas and call for international support to developing countries. What are the links between development finance and climate finance? How are climate considerations integrated into development finance? This paper shows that donors have increasingly mainstreamed climate action across sectors and areas of development co-operation. While total development finance to developing countries increased strongly over 2013-2022, climate-related development finance grew even faster. The growing integration of climate objectives across sectors, paired with the strong absolute growth in total development finance, has thus driven the strong increase in climate-related development finance. This suggests that climate has moved to the centre of the international development co-operation agenda.