United In Science High-level synthesis report of latest climate science information convened by the Science Advisory Group of the UN Climate Action Summit 2019
"Climate change is the deﬁning challenge of our time. This important document by the United Nations and global partner organizations, prepared under the auspices of the Science Advisory Group of the Climate Action Summit, features the latest critical data and scientiﬁc ﬁndings on the climate crisis. It shows how our climate is already changing, and highlights the far-reaching and dangerous impacts that will unfold for generations to come. Science informs governments in their decision-making and commitments. I urge leaders to heed these facts, unite behind the science and take ambitious, urgent action to halt global heating and set a path towards a safer, more sustainable future for all."
Antonio Guterres, United Nations Secretary-General (Foreword)
The UN Climate Action Summit 2019 Science Advisory Group called for this High Level Synthesis Report, to assemble the key scientiﬁc ﬁndings of recent work undertaken by major partner organizations in the domain of global climate change research, including the World Meteorological Organization, UN Environment, Global Carbon Project, the Intergovernmental Panel on Climate Change, Future Earth, Earth League and the Global Framework for Climate Services.
The Report provides a uniﬁed assessment of the state of our Earth system under the increasing inﬂuence of anthropogenic climate change, of humanity’s response thus far and of the far-reaching changes that science projects for our global climate in the future.
The scientiﬁc data and ﬁndings presented in the report represent the very latest authoritative information on these topics. It is provided as a scientiﬁc contribution to the UN Climate Action Summit 2019, and highlights the urgent need for the development of concrete actions that halt the worst effects of climate change.