Environmental activists across the world slammed German engineering conglomerate Siemens on Monday after it decided to carry on with a controversial coal mine project in Australia.

After holding talks with environmentalists in Berlin last week, CEO Joe Kaeser said Sunday that Siemens would go ahead with plans to provide rail infrastructure for the Carmichael mine in Queensland.

On Monday, activists from the “Fridays for Future” movement responded by protesting in front of the company’s offices in 15 German cities, including Berlin, Hamburg and Munich.