G:
Global Warming & Climate Change: Science Tracer Bullet - updated Feb. 2011 - Finding guide from the Library of Congress, Science Reference Service [U.S. Library of Congress (LOC)]

H:
Health Risk Assessments - Risk assessment portal [U.S. Environmental Protection Agency (EPA)]

Health Risks of Atomic Bomb Exposure - Webcast of a presentation by Human geneticist William Jack Schull, outlining the health effects of exposure to atomic bomb radiation. [U.S. Library of Congress (LOC)]

N:
Natural Disasters: A Guide to Selected Resources - Science Reference Guide - A finding guide from the Library of Congress, Science Reference Services [U.S. Library of Congress (LOC)]

S:
Science and Technology Policy - Science Tracer Bullet - Research guide from the Library of Congress, Science Reference Section [U.S. Library of Congress (LOC)]

U:
United States Global Change Research Program - Coordinates and integrates federal research on changes in the global environment and their implications for society. [Multiple agencies involved]