Twila A. Moon

(she/her)

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  • Deputy Lead Scientist, National Snow and Ice Data Center (NSIDC), Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder
As temperatures rise, the timing of the ice thaw changes. Vincent Denarie via Arctic Report Card

From record warming to rusting rivers, 2025 Arctic Report Card shows a region transforming faster than expected

Matthew L. Druckenmiller, University of Colorado Boulder; Rick Thoman, University of Alaska Fairbanks, and Twila A. Moon, University of Colorado Boulder

The 20th anniversary of the annual report tracks how sea ice, snow cover and many other vital signs of the Arctic have changed, and the impact that’s having on people and wildlife.
Thawing permafrost and changing seasons affect wildlife across the Arctic. Dennis Welker/E+ via Getty Images

Arctic has changed dramatically in just a couple of decades – 2024 report card shows worrying trends in snow, ice, wildfire and more

Twila A. Moon, University of Colorado Boulder; Matthew L. Druckenmiller, University of Colorado Boulder, and Rick Thoman, University of Alaska Fairbanks

Rapid changes underway in the Arctic affect the region’s people and wildlife, and the entire planet.
Giovanna Stevens grew up harvesting salmon at her family’s fish camp on Alaska’s Yukon River. Climate change is interrupting hunting and fishing traditions in many areas. AP Photo/Nathan Howard

Arctic Report Card 2023: From wildfires to melting sea ice, the warmest summer on record had cascading impacts across the Arctic

Rick Thoman, University of Alaska Fairbanks; Matthew L. Druckenmiller, University of Colorado Boulder, and Twila A. Moon, University of Colorado Boulder

The early heat melted snow and warmed rivers, heating up the land and downstream ocean areas. The effects harmed salmon fisheries, melted sea ice and fueled widespread fires.
Rainier winters make life more difficult for Arctic wildlife and the humans who rely on them. Scott Wallace/Getty Image

Arctic Report Card 2022: The Arctic is getting rainier and seasons are shifting, with broad disturbances for people, ecosystems and wildlife

Matthew L. Druckenmiller, University of Colorado Boulder; Rick Thoman, University of Alaska Fairbanks, and Twila A. Moon, University of Colorado Boulder

The annual report is also a reminder that what happens in the Arctic affects the rest of the world.
Community members from Utqiagvik, Alaska, look to open water from the edge of shorefast sea ice. Matthew Druckenmiller

2021 Arctic Report Card reveals a (human) story of cascading disruptions, extreme events and global connections

Matthew L. Druckenmiller, University of Colorado Boulder; Rick Thoman, University of Alaska Fairbanks, and Twila A. Moon, University of Colorado Boulder

Sea ice is thinning at an alarming rate. Snow is shifting to rain. And humans worldwide are increasingly feeling the impact of what happens in the seemingly distant Arctic.

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