By Karolos Grohmann PARIS (Reuters) -A environmental activist interrupted the French Open men’s semi-final between Marin Cilic of Croatia and Norwegian Casper Ruud for 15 minutes on Friday when she jumped onto Court Philippe Chatrier and tied and glued herself to the net. The woman, a French citizen, wearing a t-shirt that read ‘we have 1028 days left’ tied herself to the edge of the net with a string around her neck. The message, written on both sides of her white t-shirt, was a reference to a UN report on climate change. “An environmental activist managed to get onto Philippe Chatrier Court …