نتایج جستجو برای: global change
تعداد نتایج: 992480 فیلتر نتایج به سال:
Some engineers and scientists recently have suggested that it would be prudent to consider engaging in geoengineering to mitigate global warming. Geoengineering differs from other methods for mitigating global warming because it involves a deliberate effort to affect the climate at a global scale. Although geoengineering is not a new idea, it has taken on added significance as a result of diffi...
Integrated sediment multiproxy studies and modeling were used to reconstruct past changes in the Baltic Sea ecosystem. Results of natural changes over the past 6000 years in the Baltic Sea ecosystem suggest that forecasted climate warming might enhance environmental problems of the Baltic Sea. Integrated modeling and sediment proxy studies reveal increased sea surface temperatures and expanded ...
Changes in variance are infrequently examined in climate change ecology. We tested the hypothesis that recent high variability in demographic attributes of salmon and seabirds off California is related to increasing variability in remote, large-scale forcing in the North Pacific operating through changes in local food webs. Linear, indirect numerical responses between krill (primarily Thysanoes...
Efforts by scientists, civil society and some politicians to sound the alarm on the threats of global warming, climate change, biodiversity damages, endemics and, more broadly, all environmental issues, seem to have resulted in an increasingly shared consensus about the need for action. Yet, such action has been particularly slow in coming and has not so far resulted in any “environmental New D...
Giovanni Ravazzani 1,*, Francesco Dalla Valle 2, Ludovic Gaudard 3,4, Thomas Mendlik 5, Andreas Gobiet 5,6 and Marco Mancini 1 1 Department of Civil and Environmental Engineering, Politecnico di Milano, Milan 20133, Italy; [email protected] 2 ENEL S.p.A.-Energy Management Division, Mestre 30172, Italy; [email protected] 3 Institute for Environmental Sciences, University of Gen...
The diversity of life is ultimately generated by evolution, and much attention has focused on the rapid evolution of ecological traits. Yet, the tendency for many ecological traits to instead remain similar over time [niche conservatism (NC)] has many consequences for the fundamental patterns and processes studied in ecology and conservation biology. Here, we describe the mounting evidence for ...
This study represents part of a project by the Global Change and Terrestrial Ecosystem Soil Erosion Network to validate wind erosion models. Soil loss measurements from 46 storm events from eroding fields in six states were compared to predictions from the Wind Erosion Prediction System (WEPS) erosion submodel. The field data were collected from small (2.5 ha), circular, cropland fields with no...
In the southeastern United States, climate models project a temperature increase of 2–10°C by 2100 (Intergovernmental Panel on Climate Change 2007). Climate change is already evident. Since the 1970s, average temperature has risen by about 1°C, with the greatest seasonal temperature increase during winter. Average precipitation during autumn has increased by 30% since 1901, but summer precipita...
Physiological limits determine susceptibility to environmental changes, and can be assessed at the individual, population or species/lineage levels. Here I discuss these levels in Drosophila, and consider implications for determining species susceptibility to climate change. Limits at the individual level in Drosophila depend on experimental technique and on the context in which traits are eval...
The world is getting warmer, both in the atmosphere and in the oceans. The year 2005 was the warmest year in over a century, according to a recent NASA report (2006A). Data gathered from 1995 to 2006 have revealed that 11 of the past 12 years have ranked among the 12 warmest years in the instrumental record. Observations since 1961 have shown that the average ocean temperature has increased to ...
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