What happens when thawing permafrost changes the chemistry of a river?

In this episode of The Climate Translation, Dr. Mac explores the strange orange rivers appearing across parts of Arctic Alaska. These waterways may look polluted, but in many cases the source is natural chemistry triggered as thawing ground allows water and oxygen to reach minerals that were previously frozen away. Iron, sulfuric acid, and other metals can then move into nearby streams, turning rocks orange and altering water quality far downstream.

The episode also examines what these changes could mean for aquatic ecosystems, including Dolly Varden spawning habitat, and why not every Arctic river is destined to rust. Climate change is opening new pathways beneath the surface, but local geology, groundwater, and river chemistry determine what happens next.

CC0 Music from Charles Korpics - I want to Live! (Again)

Why are hurricanes common across so many tropical oceans, but almost completely absent from the South Atlantic?

In this episode of The Climate Translation, Dr. Mac explores the unusual combination of ocean and atmospheric conditions that normally prevents hurricanes from forming between South America and Africa. Strong wind shear, fewer organized tropical disturbances, and less favorable ocean conditions all help make the South Atlantic one of the most hostile hurricane basins on Earth.

The episode also looks at Hurricane Catarina, the only hurricane confirmed there during the satellite era, and the rare conditions that allowed it to form. From there, Dr. Mac examines what climate models suggest about the future. A warmer South Atlantic may make tropical development easier in some situations, but changes in wind shear and atmospheric circulation could continue suppressing storms. The result is a climate question with no simple answer: hurricanes may remain rare, but the few storms that do form could occur in a warmer, more energetic environment.

CC0 Music from Charles Korpics - I want to Live! (Again)

What happens when a mountain that has looked stable for centuries suddenly gives way?

In this episode of The Climate Translation, Dr. Mac explores how glaciers, frozen ground, fractured rock, and gravity work together to shape the stability of high mountain environments. Using the August 2026 collapse at Langtang Lirung in Nepal as a case study, he explains how rock and ice can break loose, race downhill, and trigger a cascade of debris flows, blocked rivers, and flooding far downstream.

The episode also examines what scientists can and cannot say about the role of climate change. Warming temperatures are shrinking glaciers, thawing permafrost, and changing how water moves through mountain rock, but that does not mean climate change can be blamed for every individual collapse. Instead, the science shows how a warming climate can alter the conditions that help determine whether a mountain slope remains stable.

CC0 Music from Charles Korpics - I want to Live! (Again)