Safa Motesharrei

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The biophysical effects of forests on climate have been extensively studied with climate models. However, models cannot accurately reproduce local climate effects due to their coarse spatial resolution and uncertainties, and field observations are valuable but often insufficient due to their limited coverage. Here we present new evidence acquired from(More)
Physical systems with time-varying internal couplings are abundant in nature. While the full governing equations of these systems are typically unknown due to insufficient understanding of their internal mechanisms, there is often interest in determining the leading element. Here, the leading element is defined as the sub-system with the largest coupling(More)
Changes in vegetation activity are driven by multiple natural and anthropogenic factors, which can be reflected by Normalized Difference Vegetation Index (NDVI) derived from satellites. In this paper, NDVI trends from 1982 to 2012 are first estimated by the Theil–Sen median slope method to explore their spatial and temporal patterns. Then, the impact of(More)
Modeling sustainability: population, inequality, consumption, and bidirectional coupling of the Earth and Human Systems Safa Motesharrei1,∗,†, Jorge Rivas2,†, Eugenia Kalnay1,†, Ghassem R. Asrar3, Antonio J. Busalacchi4, Robert F. Cahalan5,6, Mark A. Cane7, Rita R. Colwell1, Kuishuang Feng1, Rachel S. Franklin8, Klaus Hubacek1, Fernando Miralles-Wilhelm1,3,(More)
Cosmis strings are the most promising among the cosmological defects. They also constitute earliest possible observable strings, therefore prove vital for string theorists. Here I review different kinds of cosmological defects, then focus on the cosmic strings. I give a short theoretical derivation first and then discuss experimental efforts to detect them.
The Chinese National Forest Inventory (NFI) has reported increased forest coverage in China since 2000, however, the new satellite-based dataset Global Forest Change (GFC) finds decreased forest coverage. In this study, four satellite datasets are used to investigate this discrepancy in forest cover change estimates in China between 2000 and 2013: forest(More)
Physical systems with time-varying internal couplings are abundant in nature. While the full governing equations of these systems are typically unknown due to insufficient understanding of their internal mechanisms, there is often interest in determining the leading element. Here, the leading element is defined as the sub-system with the largest coupling(More)
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