After hitting 100 degrees Wednesday, Portland’s light-rail trains are operating at slower speeds amid concern that the heat will cause tracks to expand and risk a derailment. In exchange for the slow service, inspectors are not checking riders for tickets.

Horned Puffin sighted near Smith Island in the Eastern Strait of Juan de Fuca, WA.

Scientists report the latest data from the Upper Gulf of Mexico, and the results aren’t good.

Human-polar bear interactions are part of life in Arctic communities, but as melting sea ice forces polar bears onto dry land, they are becoming more common and potentially more dangerous. This is the message of a recent scientific paper. Listen now

Climate change before your eyes: Seas rise and trees die

Reddish growth on rosehip leaves

In 2015, South Asia experienced a deadly heat wave that killed roughly 3,500 people in Pakistan and India in a matter of months. New research suggests the region could face much worse by the end of the century.

The risk associated with any climate change impact reflects intensity of natural hazard and level of human vulnerability. Previous work has shown that a wet-bulb temperature of 35°C can be considered an upper limit on human survivability. On the basis of an ensemble of high-resolution climate change simulations, we project that extremes of wet-bulb temperature in South Asia are likely to approach and, in a few locations, exceed this critical threshold by the late 21st century under the business-as-usual scenario of future greenhouse gas emissions. The most intense hazard from extreme future heat waves is concentrated around densely populated agricultural regions of the Ganges and Indus river basins. Climate change, without mitigation, presents a serious and unique risk in South Asia, a region inhabited by about one-fifth of the global human population, due to an unprecedented combination of severe natural hazard and acute vulnerability.

Another troubling sign of the poor state of this year's Pacific Ocean salmon runs was discovered on one the Klamath River's tributaries after an annual fish survey counted the second lowest number of spring-run Chinook salmon on record.

To varying degrees, nearly the entire state was warmer than normal this July, according to a weather expert.

While it researches long-term solutions, Iqaluit is looking at small fixes, like flexible pipe connectors, to stop pipes from breaking and leaking.

A new report shows toxins from suppliers to companies like Tyson Foods are pouring into waterways, causing marine life to leave or die

In Southwest Alaska, a tired crew of volunteers on Saturday night, dragged a large whale’s carcass onto shore near Napaskiak’s airport. The whale was grey, bloody and barnacled, and the men who set to work butchering it said it was at least 37-feet long. Residents are still distributing its blubber and meat, saying it will feed families throughout the Yukon Kuskokwim Delta for months.

Unidentified, deceased, sea animal washes ashore on Togiak beach

Australia has had its warmest July on record, the Bureau of Meteorology (BOM) has said. A BOM report released today shows the country's average July temperature was at its highest in more than 100 years of weather recording.

For the second year in a row, people around Dillingham, Aleknagik and Wood-Tikchik State Park and the Togiak National Wildlife Refuge are reporting a massive outbreak of caterpillars. Listen now

By the end of the century, the global temperature is likely to rise more than 2 degrees Celsius, or 3.6 degrees Fahrenheit.

In July 2017 extremely high temperatures were recorded all over Cyprus. Specifically, the mean provisional daily maximum temperatures of Athalassa, Prodromos, Pafos Airport, Larnaka Airport and Paralimni are a record of high temperatures of July and rank July 2017 as the hottest for at least the last 30 years.