Gulev, Sergey. K, Thorne, Peter, Ahn, Jinho, Dentener, Frank, Domingues, Catia. M, Gerland, Sebastian, Gong, Daoyi, Kaufman, Darrell. S., Nnamchi, Hyacinth. C., Quaas, Johannes, Rivera, Juan.A., Sathyendranath, Shubha, Smith, Sharon.L, Trewin, Blair, von Schuckmann, Karina and Vose, Russell (2023) Changing State of the Climate System (Chapter 2). In Climate Change 2021: The Physical Science basis. In: Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, United Kingdom and New York, NY, USA, pp. 287-422.