Agence France Presse: Thousands marched through Madrid on Sunday to demand that the Spanish government adopt concrete measures to fight climate change, organisers said. "We demand a law against climate change that calls for an increase in the use of renewable energy and that favours saving energy," Raquel Monton, a spokeswoman for the Spanish branch of Greenpeace, told Cadena Ser radio. Greenpeace was one of about 40 green groups that backed the protest in the Spanish capital, two days …