Editing Light pollution (section)

=== Europe ===
Inspection of the area surrounding Madrid reveals that the effects of light pollution caused by a single large conglomeration can be felt up to {{convert|100|km|0|abbr=on}} away from the center.<ref name="NWA" />

Global effects of light pollution are also made obvious. Research in the late 1990s showed that the entire area consisting of southern England, Netherlands, Belgium, West Germany, and northern France have a sky brightness of at least two to four times normal.<ref name="NWA" /> The only places in continental Europe where the sky can attain its natural darkness are in northern Scandinavia and in islands far from the continent.{{citation needed|reason=The image shows large dark areas in the eastern Kola peninsula and Nenetsia. |date=November 2021}} The growth of light pollution on the green band has been 11% from 2012–2013 to 2014–2020, and 24% on the blue band.<ref>{{Cite journal |last1=Sánchez de Miguel |first1=Alejandro |last2=Bennie |first2=Jonathan |last3=Rosenfeld |first3=Emma |last4=Dzurjak |first4=Simon |last5=Gaston |first5=Kevin J. |date=2022-09-16 |title=Environmental risks from artificial nighttime lighting widespread and increasing across Europe |journal=Science Advances |language=en |volume=8 |issue=37 |pages=eabl6891 |doi=10.1126/sciadv.abl6891 |pmid=36103525 |pmc=9473566 |bibcode=2022SciA....8L6891S |issn=2375-2548}}</ref>