Nation: "There is an increasing recognition that the environments in which people live, work, learn and play have a tremendous impact on their health,' reads a letter sent Friday to Secretary of State John Kerry by the American Public Health Association (APHA) and the National Association of County and City Health (NACCHO). "The administration will certainly benefit by having a clear understanding of how the proposed Keystone XL pipeline could impact the public's health, including the health of our most...