The paper formulates 10 points for mitigation ambition and includes recommendations on ways to support ambition raising through international cooperation. All governments have committed to the long-term goal of the Paris Agreement. The findings of IPCC 1.5 Special Report (IPCC 1.5SR) illustrate the climate impacts and risks associated with exceeding 1.5°C and clearly underscore that greater ambition is urgently needed to achieve this limit as current Nationally Determined Contributions (NDCs) are inconsistent with Paris compatible pathways. This has implications for the role of the NDC Cluster and other initiatives (such as the NDC-Partnership) in supporting increased mitigation ambition in new and updated NDCs globally, as well as submission of long-term strategies, by 2020.