35 research outputs found

    Welfare Implications of Community Forest Plantations in Developing Countries: The Orissa Social Forestry Project

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    Community forest plantations are a common intervention in developing countries. We use household and remote sensing data from Orissa, India, to estimate welfare effects of community forest plantations, in terms of the value of decreased collection times plantations afford users. A selection model, accounting for possible jointness in site location and productivity, is used to estimate collection production functions for different household labor categories in natural and community forests. Two measures of an opportunity cost of time are used to determine welfare effects of time saved due to community forests. We find access to community forests is important to marginal productivity of different labor categories, but to different degrees, highlighting the need to disaggregate household data when analyzing these interventions. We also find substantial welfare improvements from time savings for many households and villages. Copyright 2005, Oxford University Press.

    NIST Standards for Measurement, Instrument Calibration, and Quantification of Gaseous Atmospheric Compounds

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    There are many gas phase compounds present in the atmosphere that affect and influence the earth’s climate. These compounds absorb and emit radiation, a process which is the fundamental cause of the greenhouse effect. The major greenhouse gases in the earth’s atmosphere are carbon dioxide, methane, nitrous oxide, and ozone. Some halocarbons are also strong greenhouse gases and are linked to stratospheric ozone depletion. Hydrocarbons and monoterpenes are precursors and contributors to atmospheric photochemical processes, which lead to the formation of particulates and secondary photo-oxidants such as ozone, leading to photochemical smog. Reactive gases such as nitric oxide and sulfur dioxide are also compounds found in the atmosphere and generally lead to the formation of other oxides. These compounds can be oxidized in the air to acidic and corrosive gases and contribute to photochemical smog. Measurements of these compounds in the atmosphere have been ongoing for decades to track growth rates and assist in curbing emissions of these compounds into the atmosphere. To accurately establish mole fraction trends and assess the role of these gas phase compounds in atmospheric chemistry, it is essential to have good calibration standards. The National Institute of Standards and Technology has been developing standards of many of these compounds for over 40 years. This paper discusses the development of these standards
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