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The oranging of northern rivers seems to be related to recent permafrost thaw that has allowed streams to release previously captive iron, trace metals and acid.
The EPA plans to limit or eliminate a chemical commonly used in car tires, known as 6PPD, after it was found to be fatal to salmon in preliminary Alaska sampling, in response to a petition from Native Tribes and several states, but the rulemaking process is expected to take years.
The warming of the Arctic has caused a significant shift in the ecosystem of Great Slave Lake, with smaller diatoms replacing larger ones, potentially impacting the lake's productivity, carbon dynamics, food web, and nearby communities.
Scientists warn that methane trapped beneath the Greenland ice sheet could intensify climate warming as the ice melts, releasing the potent greenhouse gas into the atmosphere at accelerating rates.
If added altogether, deposits of wood across the Mackenzie River Delta would cover a third of Yellowknife. Researchers calculated how much carbon it stores — which is at risk of entering the atmosphere more quickly as the climate changes.
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