How a Warming Planet Drives Human Migration

GR:  Thoughts on Climate Change

The climate news today (and really every day now) is not good. The Times article below focuses on just one of the bad bits. Global warming and consequent shifts in weather patterns are stressing everyone, but especially those people living in equatorial regions. Droughts, fires, and floods are becoming intolerable. The emerging climate-change-driven diaspora will carry the stress north and south into temperate latitudes. Projections made by many scientists in the U. S., European Union, and Asia portray a dismal future for Earth and humanity.

A Glimpse of Future Earth

Climate-change emigrants and their descendents moving north will not escape the ravages of a warming planet for very long. Stresses in northern latitudes have already begun. As the human population squeezes north to find food and water, resources will dwindle and conflicts will intensify. Nature in even the diminished form that we see now will sink toward unsustainable levels where wild plants and animals, then watersheds, then soils, and then fresh water are lost.

As I look out across my fields of invasive weeds and my ponds and small stream choked with artificially fertilized algae and filled with invasive animals, I remember the sunflowered fields and sparkling creek of my history. As the pace of climate change accelerates, “the good old days” will become a meaningful phrase for younger and younger people facing a constant need to adapt to more difficult times.

Want to keep up with the changes? The Daily Climate carries the best selection of current stories I’ve found. The Daily Climate included a link to the story below along with dozens of others. (Header image:  A farmer tries to revive his unconscious cow. Photo by CNN.)

Illustration by La Tigre.

“Climate change is not equal across the globe, and neither are its longer term consequences. This map overlays human turmoil — represented here by United Nations data on nearly 64 million “persons of concern,” whose numbers have tripled since 2005 — with climate turmoil, represented by data from NASA’s Common Sense Climate Index. The correlation is striking. Climate change is a threat multiplier: It contributes to economic and political instability and also worsens the effects. It propels sudden-onset disasters like floods and storms and slow-onset disasters like drought and desertification; those disasters contribute to failed crops, famine and overcrowded urban centers; those crises inflame political unrest and worsen the impacts of war, which leads to even more displacement. There is no internationally recognized legal definition for “environmental migrants” or “climate refugees,” so there is no formal reckoning of how many have left their homes because climate change has made their lives or livelihoods untenable. In a 2010 Gallup World Poll, though, about 12 percent of respondents — representing a total of 500 million adults — said severe environmental problems would require them to move within the next five years.

  1. ‘Amazon Basin: As glacial melting reduces freshwater reserves for the Andean plain, tensions are growing between locals and the mining and agribusiness operations that consume much of what remains. Researchers predict that this resource conflict will drive more migrants to the Amazon Basin where many have already turned to informal mining and coca cultivation, fueling the rise of criminal syndicates.

  2. “Lake Chad, 3. Syria, 4. China, 5. Philippines” –Jessica Benko (New York Times: Continue reading.)

Marine hotspots under dual threat from climate change and fishing

A beautiful split image of a school of yellow butterfly fishes and the blue sky in French Polynesia

A beautiful split image of a school of yellow butterfly fishes and the blue sky in French Polynesia. Credit: Global_Pics/iStock/Getty Images.

GR: Nature rarely forms straight lines or even distributions. Global warming, just like biodiversity, is not even. The study reported below suggests areas that need our greatest conservation efforts. However, we have to try to save more than just the best areas. We also need to save some of the intervening regions.

The parts of the world’s oceans with the most varied mix of species are seeing the biggest impacts from a warming climate and commercial fishing, a new study warns.

“The research, published in Science Advances, identifies six marine “hotspots” of “exceptional biodiversity” in the tropical Pacific, southwestern Atlantic, and western Indian Oceans.

“Warming sea temperatures, weakening ocean currents and industrial fishing means these areas are at particular risk of losing many of their species, the researchers say.

Species richness

“From the cold depths of the Arctic waters to the colourful reefs of the tropics and subtropics, the oceans play host to tens of thousands of different species. But they are not evenly spread across the world.

“Using data on 1,729 types of fish, 124 marine mammals and 330 seabirds, the new study estimates how varied the species are in each part of the oceans. They call this the species “richness”.

“You can see this in the map from the study below. It shows an index of species richness, from the lowest (dark blue) to the highest (red).

marine-hotspots

Map of global marine biodiversity, using an index from zero (no species present, shaded dark blue) up to one (largest species richness, shaded red) representing 2,183 marine species. Map also shows the six marine “hotspots” identified in the study. Source: Ramírez et al. (2017)

“From this process, the researchers identified six hotspots where the number and mix of species is exceptionally high. These are outlined in the map above.

“The six hotspots are predominantly in the southern hemisphere. Three are closely packed together around southeast Asia (4), southern Australia and New Zealand (5), and the central Pacific Ocean (6). The other three are more spread out, covering Africa’s southeastern coastline and Madagascar (3), the Pacific waters of Peru and the Galapagos Islands (1), and the southwestern Atlantic ocean off the coast of Uruguay and Argentina (2).” –Robert McSweeney (Continue reading:  Marine hotspots under dual threat from climate change and fishing.)