Greenpeace India, an international environmental organisation, has launched its paper, Blue Alert- climate migrants in South Asia: Estimates and solutions, in the city on Tuesday. This is a part of the organisation's emphasis on the crisis that will be faced by the South Asian region if global warming is not kept below the two degree tipping point. Speaking on the occasion, author of the paper and professor of Humanities and Social Sciences at IIT Madras Sudhir Chella Rajan said: If greenhouse gas emissions are not curbed, by the end of this century global temperature will rise by four to five degree celsius, leading to the rise in sea level by about five metres, severe floods and droughts.