Science
22 April 2016 Vol 352, Issue 6284
http://www.sciencemag.org/current.dtl

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In Depth
Refugee crisis brings new health challenges
By Kai Kupferschmidt
Science22 Apr 2016 : 391-392
Imported pathogens are a much bigger threat to migrants than they are to Europeans.
Summary
More than a million refugees and migrants entered Europe last year, mostly from Syria, Afghanistan, and Iraq. This exodus is creating new challenges for European public health officials. Many of the migrants come from countries where public health systems are in disarray, and some are infected with pathogens that are rare, or even unheard of, in Europe. Germany saw a 30% increase in the number of tuberculosis cases in 2015; doctors also need to be prepared for diseases they have never seen before. Still, scientists say that the influx of unusual infections is far less a threat to native-born Europeans than to the health of the refugees themselves.

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Policy Forum
Filling in biodiversity threat gaps
By L. N. Joppa, B. O’Connor, P. Visconti, C. Smith, J. Geldmann, M. Hoffmann, J. E. M. Watson, S. H. M. Butchart, M. Virah-Sawmy, B. S. Halpern, S. E. Ahmed, A. Balmford, W. J. Sutherland, M. Harfoot, C. Hilton-Taylor, W. Foden, E. Di Minin, S. Pagad, P. Genovesi, J. Hutton, N. D. Burgess
Science22 Apr 2016 : 416-418
Only 5% of global threat data sets meet a “gold standard”
Summary
The diversity of life on Earth—which provides vital services to humanity (1)—stems from the difference between rates of evolutionary diversification and extinction. Human activities have shifted the balance (2): Species extinction rates are an estimated 1000 times the “background” rate (3) and could increase to 10,000 times the background rate should species threatened with extinction succumb to pressures they face (4). Reversing these trends is a focus of the Convention on Biological Diversity’s 2020 Strategic Plan for Biodiversity and its 20 Aichi Targets and is explicitly incorporated into the United Nations’ 2030 Agenda for Sustainable Development and its 17 Sustainable Development Goals (SDGs). We identify major gaps in data available for assessing global biodiversity threats and suggest mechanisms for closing them.

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Perspectives
Waste not, want not, emit less
By Jessica Aschemann-Witzel
Science22 Apr 2016 : 408-409
Reducing food waste in the supply chain and at home can help to reduce carbon emissions
Summary
Ensuring a sufficient supply of quality food for a growing human population is a major challenge, aggravated by climate change and already-strained natural resources. Food security requires production of some food surpluses to safeguard against unpredictable fluctuations (1). However, when food is wasted, not only has carbon been emitted to no avail, but disposal and decomposition in landfills create additional environmental impacts. Decreasing the current high scale of food waste is thus crucial for achieving resource-efficient, sustainable food systems (2). But, although avoiding food waste seems an obvious step toward sustainability, especially given that most people perceive wasting food as grossly unethical (3), food waste is a challenge that is not easily solved.