Agence France-Presse: Hundreds of Lebanese, many wearing snorkels, held demonstrations Saturday in key archaeological sites nationwide to mark an international day of protests about global warming. Protesters gathered at Roman ruins in central Beirut, in the ancient eastern city of Baalbek and along the coast, carrying placards bearing the logo 350 to call for carbon emissions cuts to 350 parts per million (ppm). Organisers expect up to 800 people to take part in the day-long protests which are due …