An environmental activist wearing a face-mask depicting US President Donald Trump takes part in a demonstration in front of the United Nations building, where experts from across the planet locked in key talks aimed at breathing life into the Paris Agreement on climate change, in Bangkok on September 8, 2018. - The 2015 Paris deal -- which must be adopted by signatory nations by December 2018-- aims to limit global temperature rises to "well below" two degrees Celsius and to less than 1.5 degrees if possible. (Photo by LILLIAN SUWANRUMPHA / AFP)