Climate: Pikas disappearing from marginal habitat

New study documents population declines in Great Basin

Colorado pika
A Quandary Peak pika enjoys some sunny weather on a rocky ledge in the Colorado Rocky Mountains. @bberwyn photo.

Staff Report

U.S. Geological Survey scientists have filled in another piece in the pika puzzle, finding that changes in distribution of populations of the tiny mammals are mainly influenced by climatic factors. The new study, published in The Journal of Mammalogy, helps show how global warming will affect the species.

Several previous research efforts have been inconclusive, and one study from Colorado suggests that pikas are holding their own in the highest reaches of the central and southern Rocky Mountains. But the new study, conducted in 2014 and 2015 at 910 sites, showed  widespread reduction in pika range in three mountainous regions including the Great Basin, southern Utah and northeastern California.

Another recent study that included National Park Service researchers tried to project where pikas will be able to persist in places like Rocky Mountain National Park, Crater Lake and Yellowstone National Park. More information is available on the NPS Pikas in Peril website. Continue reading “Climate: Pikas disappearing from marginal habitat”

Antarctic sea ice meltdown likely in a warming world

New study offers climate clues from most recent interglacial warm period

Antarctic sea ice
Antarctic sea ice is likely to decline dramatically in coming decades, which could lead to amplification of global warming in the southern hemisphere. @bberwyn photo.

By Bob Berwyn

The last time the Earth was as warm as today was about 128,000 years ago — and Antarctic sea ice extent was 65 percent smaller than it is now, according to British scientists who tracked past climate change in the region by studying ice core samples from that era.

That means Antarctic sea ice is on course to shrink dramatically in the decades and centuries ahead, said British Antarctic Survey scientist Max Holloway, who with a team of researchers analyzed oxygen isotopes in ice and air bubbles trapped for 128,000 years in the East Antarctic Ice Sheet. Continue reading “Antarctic sea ice meltdown likely in a warming world”

Sunday set: Misty mountains

Heart of Austria

A few days in the Salzkammergut, in search of cheese produced on juicy alpine pastures, yielded this set of shots, showing that cloudy days are good days for mountain photography — as long as you can keep your camera dry. Visit our online gallery for more landscape and nature photography, where you can buy prints, postcards and more, all while supporting independent environmental journalism. More info on climate change in the Austrian mountains at our Global Warming in the Alps blog.

Ocean acidification seen as huge threat to Atlantic cod

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Climate change to put a big hit on cod stocks.

Fish larvae seen as highly sensitive to CO2

Staff Report

New lab experiments suggest that increasing ocean acidification could take a big bite out of the economically important cod fishery in the North Atlantic. The research suggests that the buildup of CO2 in the ocean could double the mortality of newly-hatched cod larvae.

Members of the German research network BIOACID quantified the impacts, showing that recruitment could decrease to levels of one quarter to one twelfth of the recruitment of the last decades. Cod have already been under intense fishing pressure for decades, and the new study, published in the online journal PLOS ONE, identifies climate change as an emerging new threat. Continue reading “Ocean acidification seen as huge threat to Atlantic cod”

Colorado Gov. Hickenlooper eyes executive order on climate change

Is Colorado a hotspot for global warming?
Is Colorado a hotspot for global warming?

Draft document highlights global warming threats to state

Staff Report

Colorado Governor John Hickenlooper says a “shifting climate” threatens many of the state’s vital industries, including skiing and agriculture, and he wants the state’s power plants to cut greenhouse gas emissions by 35 percent in the next 15 years from 2012 levels. The goals are outlined in a draft version of an executive order on mitigating and adapting to climate change, which spells out some specific threats of global warming that are already well-known, including:

  • Greater air pollution will lead to a more hospital admissions and increased cases of respiratory illness;
  • Changes in precipitation can adversely impact the amount and quality of Colorado’s water resources;
  • Changes in runoff patterns, intense precipitation, and rising temperatures can negatively affect food production and result in greater risk of food contamination and waterborne illness.

Continue reading “Colorado Gov. Hickenlooper eyes executive order on climate change”

Study tracks amphetamine pollution in Baltimore streams

Illegal drugs harming stream aquatic ecosystems

This is the local stream, Meadow Creek, that starts high in the Eagles Nest Wilderness Area and flows through our backyard.
A new study found that amphetamine pollution may be harming stream health. @bberwyn photo.

Staff Report

As if toxic waste from chemical manufacturing and other industrial processes weren’t enough, scientists say some streams are also being fouled by remnants of amphetamines — in some cases at high enough levels to alter the base of aquatic food chain.

A new study, published in the journal Environmental Science & Technology, traced the presence of illicit drugs at six  stream sites around Baltimore, focusing on the Gwynns Falls watershed, which is part of the Baltimore Ecosystem Study Long-Term Ecological Research program. Two rural streams were also sampled in the Oregon Ridge watershed, the closest forested region. Continue reading “Study tracks amphetamine pollution in Baltimore streams”

Global warming started earlier than you think

New study suggests climate is very sensitive to greenhouse gases

Despite ups and downs from year to year, global average surface temperature is rising. By the beginning of the 21st century, Earth’s temperature was roughly 0.5 degrees Celsius above the long-term (1951–1980) average. (NASA figure adapted from Goddard Institute for Space Studies.
Despite ups and downs from year to year, global average surface temperature is rising. By the beginning of the 21st century, Earth’s temperature was roughly 0.5 degrees Celsius above the long-term (1951–1980) average. (NASA figure adapted from Goddard Institute for Space Studies).

Staff Report

Although the rate of global warming has increased dramatically in the last few decades, a new study suggests that human activities have been driving climate change for the past 180 years. The findings suggest that global warming is not just a  20th century phenomenon, and that the climate system is, indeed, quite sensitive to the buildup of heat-trapping pollution.

The study was led by Nerilie Abram, of  The Australian National University, who  warming began during the early stages of the Industrial Revolution and started leaving a fingerprint in  the Arctic and tropical oceans around the 1830s, much earlier than scientists had expected. Continue reading “Global warming started earlier than you think”