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18. African Dust Causes Widespread Environmental Distress, USGS Information Sheet, April 2000, http://coastal.er.usgs.gov/african_dust/ofr-2001-246.pdf
19. Strong, Transparent, Multifunctional, Carbon Nanotube Sheets, Zhang et al., Science, 309, August 19, 2005: no. 5738, 1215-1219, DOI: 10.1126/science.1115311, http://www.sciencemag.org/cgi/content/abstract/309/5738/1215?ijkey=bq3ut9sDSiN9k&keytype=ref&siteid=sci
20. Geo-Engineering to Confine Climate Change: Is It At All Feasible? L. Bengtsson, Climatic Change, 77, 229-234, August 2006.
21. Climate Strategy with CO2 Capture from the Air, D.W. Keith et al., Climatic Change, 2005, published on line, DOI: 10.1007/s10584-005-9026-x. PDF
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