Greta Thunberg arrives in Lisbon to attend climate summit in Madrid Swedish teen eco-warrior Greta Thunberg arrives in Lisbon, Portugal, after crossing the Atlantic in a catamaran to attend a UN climate change summit in Madrid. Thunberg, 16, has become the face of young peoples' demands for climate action and made a point of making the journey back from September's New York climate summit by sea rather than fuel-guzzling plane. IMAGES