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In this millennium, global drylands face a myriad of problems that present tough research, management, and policy challenges. Recent advances in dryland development, however, together with the integrative approaches of global change and sustainability science, suggest that concerns about land degradation, poverty, safeguarding biodiversity, and protecting(More)
The paper begins with the problem of a firm subject to random productivity shocks drawn from a particular distribution. We are concerned with the case whereby the distribution of the shocks changes without the knowledge of the firm. Over time the firm learns about the nature and extent of the change in the distribution of the shock and adjusts, incurring(More)
OVERVIEW In June of 2000, forty-four scientists gathered in Tempe, Arizona to discuss the needs and priorities for interdisciplinary environmental research, spanning natural sciences, social sciences, engineering, and humanities. Attendees came from over a dozen different fields, and represented thirty-one institutions. This report presents the consensus(More)
Comprehensive abatement strategies will be needed to limit global warming. A drastic reduction of black-carbon emissions could provide near-immediate relief with important co-benefits. L ight-absorbing black carbon, emitted through incomplete combustion, warms the atmosphere at regional and global scales 1. Furthermore, black-carbon particulate matter is(More)
The Global Environmental Assessment Project is a collaborative team study of global environmental assessment as a link between science and policy. The Team is based at Harvard University. The project has two principal objectives. The first is to develop a more realistic and synoptic model of the actual relationships among science, assessment, and management(More)