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<jats:p> In its April 2014 report, the Intergovernmental Panel on Climate Change (IPCC) recognized that reducing greenhouse gas (GHG) emissions by 40 to 70% by mid-century will require more than just implementing emission-free solutions. Many scenarios for stabilizing GHG concentrations that were evaluated by the panel included removing carbon dioxide (CO <jats:sub>2</jats:sub> ) from the atmosphere: so-called “negative emissions” or carbon dioxide removal (CDR). Among the most promising CDR methods are reforestation, afforestation (planting new forests), and bioenergy with carbon capture and storage (BECCS). However, for BECCS strategies to succeed, major hurdles must be overcome. </jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>

<jats:p>Negotiations with university spark opposition from biomedical institute's scientists.</jats:p>

<jats:p>“Zero knowledge” tests could let inspectors identify a nuclear weapon without learning the secrets of its design.</jats:p>

<jats:p>Proposal to remove captive dolphins draws fire.</jats:p>

<jats:p>Tracking the house sparrow's spread in Africa yields secrets of these invaders—a taste for novel foods, for example.</jats:p>

<jats:p>Archaeologists are rediscovering the ancient Maritime Silk Road, which once powered more East-West commerce than the famed Central Asian land route.</jats:p>

<jats:p>The humble glass bead has become a tool to trace the migration of ancient goods and peoples around the Indian Ocean.</jats:p>

<jats:p> How does the human brain reason when to change strategies? <jats:named-content content-type="related-content"> [Also see Research Article by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6191" page="1481" related-article-type="in-this-issue" vol="344" xlink:href="10.1126/science.1252254"> Donoso <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>