“The fight against climate change is by far the most significant struggle of our times.”
Cited in: Damian Carrington, "Climate change will determine humanity's destiny, says Angela Merkel" https://www.theguardian.com/environment/2017/nov/15/climate-change-will-determine-humanitys-destiny-says-angela-merkel, The Guardian, 15 November 2017 (page visited on 15 November 2017).
United Nations Climate Change Conference (2017)