Changes occurring in the world’s climate pose significant threats to human health and wellbeing and will have even greater impacts in the future. These threats are wide-ranging, including decreased air quality and increases in extreme weather events, wildfire, and illnesses transmitted by water, and disease-carriers, such as mosquitoes and ticks. Comments on this video are allowed in accordance with our comment policy: http://www.cdc.gov/SocialMedia/Tools/CommentPolicy.html This video can also be viewed at http://www.cdc.gov/cdcgrandrounds/video/2014/GR_12-16-2014.wmv