Agence France-Presse: The United States and Vietnam will jointly study the impact of climate change on the Mekong Delta and other low-lying river regions worldwide, officials said Monday. Scientists from both countries will work at a new Delta Research and Global Observation Network (DRAGON) institute, the first of several that are due to be set up worldwide, at southern Vietnam’s Can Tho University. Vietnam is among the countries most vulnerable to climate change, said Tran Thuc, head of the …