Climate activist Greta Thunberg and former US president Barack Obama meeting. (Photo courtesy of MAX MODÉN https://www.maxmoden.com/)

Climate activist Greta Thunberg and former US president Barack Obama meeting. (Photo courtesy of MAX MODÉN https://www.maxmoden.com/)

Climate activist Greta Thunberg and former US president Barack Obama meeting. (Photo courtesy of MAX MODÉN https://www.maxmoden.com/)