Former Harvard Pop Center fellows Clemens Noelke, Mark McGovern, and Daniel Corsi, along with Pop Center Director Lisa Berkman, are among the authors of a study published in Environmental Research that looked at temperature and emotional well-being in a sample of 1.9 million Americans over a six-year period. Temperatures over 70 degrees were associated with reduced positive emotions, and increased negative emotions and fatigue, particularly among less educated and older Americans.