A wing tip that changes shape mid-flight to improve the plane's aerodynamics could reduce fuel consumption and cut noise around airports.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/morphing-winglets-make-greener-aircraft
[2] http://admin.indiaenvironmentportal.org.in/category/author/paul-marks
[3] http://admin.indiaenvironmentportal.org.in/category/journal/new-scientist
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-pollution-control
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fuel-efficiency
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-transport
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-kingdom-uk
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us