Home Business Greta Thunberg calls on Siemens to review Australia coal project Business Greta Thunberg calls on Siemens to review Australia coal project By Genpie - January 11, 2020 148 0 Facebook Twitter Google+ Pinterest WhatsApp Climate activist Greta Thunberg has called on German engineering group Siemens AG to review its role in helping to develop a coal mine project in Australia.