![Dry climate and wildfires create a residual layer of thick pollutants that cover the city of São Paulo, Brazil on September 17, 2020.](/sites/default/files/media_2021/10/202110un_climate_change_COP.jpg)
Dry climate and wildfires create a residual layer of thick pollutants that cover the city of São Paulo, Brazil on September 17, 2020.
© 2020 Marcelo Machado de Melo/Fotoarena/Sipa USA
Dry climate and wildfires create a residual layer of thick pollutants that cover the city of São Paulo, Brazil on September 17, 2020.