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Forest Service Chief`s Climate Change and Wilderness Briefing
Forest Service Chief`s Climate Change and Wilderness Briefing

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Short-Lived Climate Pollution
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The Economic Case for Divesting from Fossil Fuels
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... recognition that at some unknown and unknowable point down the road, markets will suddenly adjust the equity price of fossil fuel company shares downward to reflect the swiftly changing future prospects of those companies, however wise today, is probably not yet compelled in the exercise of prudence ...
Mechanisms of elevation-dependent warming over the Tibetan
Mechanisms of elevation-dependent warming over the Tibetan

... warning signal of global change. During recent decades, the TP has experienced more rapid warming than its vicinity (Kang et al. 2010; Liu and Chen 2000; Rangwala and Miller 2012), especially since the start of the 21st century (Yan and Liu 2014) and in future (Ji and Kang 2012). Moreover, climatic ...
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... impacts. An alternative, rapid stabilization case will be presented in the next chapter, along with a comparison of the costs of the two scenarios. The business-as-usual case is based on the high end of the “likely” range of outcomes under the IPCC’s A2 scenario (their second highest scenario), whic ...
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Climate change feedback



Climate change feedback is important in the understanding of global warming because feedback processes may amplify or diminish the effect of each climate forcing, and so play an important part in determining the climate sensitivity and future climate state. Feedback in general is the process in which changing one quantity changes a second quantity, and the change in the second quantity in turn changes the first. Positive feedback amplifies the change in the first quantity while negative feedback reduces it.The term ""forcing"" means a change which may ""push"" the climate system in the direction of warming or cooling. An example of a climate forcing is increased atmospheric concentrations of greenhouse gases. By definition, forcings are external to the climate system while feedbacks are internal; in essence, feedbacks represent the internal processes of the system. Some feedbacks may act in relative isolation to the rest of the climate system; others may be tightly coupled; hence it may be difficult to tell just how much a particular process contributes. Forcings, feedbacks and the dynamics of the climate system determine how much and how fast the climate changes. The main positive feedback in global warming is the tendency of warming to increase the amount of water vapor in the atmosphere, which in turn leads to further warming. The main negative feedback comes from the Stefan–Boltzmann law, the amount of heat radiated from the Earth into space changes with the fourth power of the temperature of Earth's surface and atmosphere.Some observed and potential effects of global warming are positive feedbacks, which contribute directly to further global warming. The Intergovernmental Panel on Climate Change's (IPCC) Fourth Assessment Report states that ""Anthropogenic warming could lead to some effects that are abrupt or irreversible, depending upon the rate and magnitude of the climate change.""
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