World Scientists' Warning of a Climate Emergency 2021. (28th July 2021) - Ripple, William J; Wolf, Christopher; Newsome, Thomas M; Gregg, Jillian W; Lenton, Timothy M; Palomo, Ignacio; Eikelboom, Jasper A J; Law, Beverly E; Huq, Saleemul; Duffy, Philip B; Rockström, Johan