Illustration: Sarah Grillo/Axios

The U.S. military views climate change as a threat multiplier, one that is likely to worsen already existing weaknesses of government and poverty.

Why it matters: Internal and external climate displacement is already occurring. Depending how quickly and significantly temperatures rise, the specter of climate migration and refugee flows looms large by midcentury.

Rising seas: In 2017 alone, nearly 19 million new internal displacements were recorded in more than 130 countries worldwide, largely triggered by extreme weather events such as floods and tropical cyclones, according to the Internal Displacement Monitoring Center. That's more than were displaced due to armed conflict in the same year, and climate change is aggravating many of these extreme weather events.

Residents of small island nations like the Marshall Islands, Vanuatu and Kiribati are fleeing rising tides and powerful storms to seek better economic opportunities in the U.S. mainland and elsewhere. Other small island countries are wrestling with contingency plans should waters rise too high.

  • A recent U.N. climate report found that many low-lying island states will face an existential threat should global warming exceed 1.5°C, or 2.7°F, above preindustrial levels by 2100.
  • On our present course, we're headed for more than 3°C, or 5.4°F, above preindustrial levels by the end of the century. Such scenarios could even spur millions of Americans to migrate away from the coast, too.
  • Elsewhere, sea level rise and the monsoon season have pushed populations inland in heavily populated Bangladesh, as Rohingya refugees are forced to settle in marginal areas vulnerable to flooding.

Drought: In addition to sea level rise, water stress is the biggest concern of humanitarian groups and military planners.

  • By making droughts hotter and drier, the threat of drought induced migration and conflict is growing in areas that are vulnerable to social and military strife.
  • Climate studies have tied the Syrian Civil War's beginnings in part to a record drought that struck the Fertile Crescent in 2007-2010, which set in motion political events that set the country on a ruinous course.
  • That drought, climate models show, was made more likely and severe due to global warming.

Precise NASA satellite measurements of groundwater storage — which acts as a water savings bank for farmers — show water stress building in heavily populated and conflict-prone parts of the world: Places like the border region between Pakistan and India, the Fertile Crescent, and the Northwest Sahara Aquifer System, which provides water for Algeria, Tunisia and war-torn Libya.

The big picture: The locations most at risk from climate change-related stresses in the near-term includes heavily populated areas like India, Pakistan and Bangladesh, and extends around the world to parts of South America and Africa, encompassing well over a billion people.

The bottom line: No refugee crisis or migration flow is purely due to climate change. But already, global warming-related factors are playing a role in setting people into motion, both within countries and between them.

Go deeper

Breaking down the Tesla obsession

Illustration: Sarah Grillo/Axios

Tesla is the company of the moment — the prime exemplar of just about any big and important trend that you might care about.

Why it matters: Almost every reader of finance and business news will have at least one strongly-held opinion about Tesla. What you might not realize is just how widely those opinions range, and the degree to which they map onto much broader views of the world.

Gallup: Party preference swings dramatically in favor of Democrats

Photo: Jim Watson/AFP via Getty Images

Americans' political party preferences have swung sharply from a 2-point Republican advantage in January to an 11-point Democratic advantage in July, according to Gallup's monthly averages of telephone polls in 2020.

The big picture: The dramatic shift is more a product of fewer people identifying as Republican or Republican-leaning (down 8% since January) than gains among those who identify as Democratic or Democratic-leaning (up 5%).

Nancy Pelosi: "I yearn for other Republican presidents"

House Speaker Nancy Pelosi (D-Calif.) called on President Trump Thursday to exercise "the full power" of the Defense Production Act to meet coronavirus equipment needs and accused him of engaging in a "massive dereliction of duty" by ignoring science during the pandemic.

What she's saying: "I yearn for other Republican presidents," Pelosi said at a press conference. "While we may have disagreed on many points, but at least we had a shared commitment to the governance of our country."