Grand Challenge on Carbon Kick off workshopThe Grand Challenge on Carbon Feedbacks in the Climate System was launched via a kick-off workshop held in Hamburg, Germany, on the 21st and 22nd of November 2016. The objective of the workshop was to strengthen the links between the Grand Challenge's guiding questions and research initiatives as well as to emphasize major gaps and to sharpen the priorities and plans of the program as a whole. Discussions amongst the 35 participants was centered around the Grand Challenge's four research areas: process understanding on land; process understanding in the ocean; learning from the existing record; and towards improving projections. The Carbon Feedbacks in the Climate System report from the Kick-off Workshop summarizes these discussions and lists proposed actions for 2017/2018.