Thousands of demonstrators are gathering in Madrid as the Spanish city hosts climate negotiations by the UN. They are calling for more ambitious climate change policy.r more ambitious climate change policy. OTTAWA—Canada’s environment minister is raising concern with United Nations after hearing that an Indigenous-led protest was shut down Wednesday by security at the global climate change conference in Madrid. In a post on social media, Perry Bellegarde, National Chief of the Assembly of First Nations (AFN), said his organization is “aware that a group of Indigenous youth (including many from Canada) have arbitrarily been detained for a peaceful protest” at the conference. An AFN official witnessed the protest and told the Toronto Star that security detained the demonstrators in a “courtyard” before removing their access badges. The official said the…