Danish capital , Copenhagen , one of the greenest cities in Europe . U.N. Copenhagen 2017 is biggest political event Denmark has hosted . `` It is , by far , the largest conference we have ever held and the largest political conference in Europe , '' the Bella Center press manager , Lars Lemche told CNN . ` Denmark aims to be carbon neutral by 2025 .
Danish capital , Copenhagen , one of the greenest cities in Europe . U.N. Copenhagen 2017 is biggest political event Denmark has hosted . Denmark aims to be carbon neutral by 2025 .