The White House: Presidential Memorandum -- Climate Change and National Security
Extended drought, more frequent and severe weather events, heat waves, warming and acidifying ocean waters, catastrophic wildfires, and rising sea levels all have compounding effects on people's health and well-being. Flooding and water scarcity can negatively affect food and energy production. Energy infrastructure, essential for supporting other key sectors, is already vulnerable to extreme weather and may be further compromised. Impacts of a changing climate can create conditions that promote pest outbreaks and the spread of invasive species as well as plant, animal, and human disease, including emerging infectious disease, and these can further undermine economic growth and livelihoods. Impacts can also disrupt transportation service, cutting off vulnerable communities from relief immediately after events and reducing economic output. These conditions, in turn, can stress some countries' ability to provide the conditions necessary for human security. All of these effects can lead to population migration within and across international borders, spur crises, and amplify or accelerate conflict in countries or regions already facing instability and fragility.
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