By Morgane Mounier PARIS, May 24 (Thomson Reuters Foundation) - Teenagers on the streets of Paris warned governments on Friday there would be no summer let-up in their efforts to push for stronger action on climate change, as international green campaigners called a global strike for Sept. 20. "I should be at school, revising for my French baccalaureat - but I'd rather be here, for my future," said Jules, 17, who only wanted to give his first name.