Salt marshes in US eroding, study shows | Scientists catalog rare Cambodian plant species | How much space is needed to fit the world's population?
February 16, 2017
AAG SmartBrief
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Geography in Action
Salt marshes in US eroding, study shows
Scientists studying eight salt marshes in the US found they are losing ground because of erosion from increases in the sea level, land development, dammed rivers and natural disintegration. Half of the salt marshes, which provide vital habitat for animals, may disappear in 350 years if no preservation measures are taken, the research shows.
The Orange County Register (Santa Ana, Calif.) (free content)/The Associated Press (2/12) 
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Scientists catalog rare Cambodian plant species
Scientists in Cambodia are documenting rare plant species and other biodiversity that has thrived in unique limestone habitats called karsts, which are threatened by cement quarrying. The karsts "are the last refuges of what made it to the Mekong Delta, natural harbors for a specialized kind of vegetation that has very little timber value, sanctuaries of rare species," says J. Andrew McDonald of the University of Texas Rio Grande Valley.
The New York Times (free-article access for SmartBrief readers) (2/13) 
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Research, Education and Global Change
Problems at Oroville Dam highlight infrastructure issues
Problems at Oroville Dam highlight infrastructure issues
(Josh Edelson/AFP/Getty Images)
The recent flooding threat at the Oroville Dam in Northern California, which forced nearly 200,000 people to evacuate, has raised questions about the condition of aging infrastructure and whether it can handle extreme weather patterns exacerbated by climate change. Meanwhile, in Oregon, seven dams have been found to be in "unsatisfactory" condition.
The New York Times (free-article access for SmartBrief readers) (2/14), (2/14),  Statesman-Journal (Salem, Ore.) (tiered subscription model) (2/14) 
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Amazon's huge diversity of trees spread over time, study finds
The Amazon's wide diversity of trees is likely due to wide-ranging dispersal throughout geological time, according to a study published in the Proceedings of the National Academy of Sciences. "Our study used a phylogenetic, evolutionary approach to show the basin has essentially acted as a sloshing bowl of green soup, with tree lineages dispersing back and forth across the basin repeatedly, throughout the last Glacial Maximum and deeper into time," said Kyle Dexter, co-author of the study.
BBC (2/14) 
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Charts: How immigrants affect the economy
Seven charts show how 25 million immigrants affect the economy, in which many occupy hard-to-fill positions in construction and programming. Among the data: Immigrants earn less on average than native-born workers, and they are more likely to start a business.
CBS MoneyWatch (2/10) 
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Technology and Applications
Study: Crop yields in poor regions could be estimated by satellite images
Study: Crop yields in poor regions could be estimated by satellite images
(Sean Gallup/Getty Images)
Satellite images may be an option for estimating crop yields in poor regions and determining which farmers need help, per a study in the Proceedings of the National Academy of Sciences. Inexpensive satellites could also be used to test interventions, Stanford University researchers said.
Reuters (2/13) 
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Association News
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The African Geographical Review is an AAG journal edited by the Africa Specialty Group. It provides a medium for the publication of geographical material relating to Africa, seeks to enhance the standing of African regional geography, and to promote a better representation of African scholarship. Articles cover all sub-fields of geography, and can be theoretical, empirical or applied in nature. Members of the AAG's Africa Specialty Group receive a complimentary online subscription to the journal. If you are interested in receiving this journal, add membership in the African Specialty Group to your AAG membership for just $15 per year ($5 for students). Join now.
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Plan your schedule for AAG 2017 with the online preliminary program
The preliminary program for the AAG Annual Meeting is now available online. The searchable program includes a preliminary agenda of sessions, plenary speakers, and specialty group meetings. You can browse the program by presenter, keyword, title, or specialty group. You can also view sessions by day using the calendar of events. Please note that sessions and events for the 2017 Annual Meeting begin on Wednesday and conclude on Sunday. Browse the program.
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Greatness after all, in spite of its name, appears to be not so much a certain size as a certain quality in human lives. It may be present in lives whose range is very small.
Phillips Brooks,
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