The first <a href="https://en.wikipedia.org/wiki/Earth_Day" id="mwrQ" rel="mw:WikiLink" title="Earth Day">Earth Day</a> is celebrated.<sup about="#mwt51" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-8"}}' id="cite_ref-8" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_22#cite_note-8" id="mwrg" style="counter-reset: mw-Ref 8;"><span class="mw-reflink-text" id="mwrw">[8]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-8"><cite about="#mwt48" class="citation book cs1" id="CITEREFMink2010">Mink, Nicolaas (2010). "Earth Day". In Chapman, Roger (ed.). <a class="external text" href="https://books.google.com/books?id=vRY27FkGJAUC" id="mwBR8" rel="mw:ExtLink nofollow"><i id="mwBSA">Culture Wars: An Encyclopedia of Issues, Viewpoints, and Voices</i></a>. Armonk, N.Y.: M.E. Sharpe. p.<span id="mwBSE" typeof="mw:Entity"> </span>148. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBSI" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBSM" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780765617613" id="mwBSQ" rel="mw:WikiLink" title="Special:BookSources/9780765617613"><bdi id="mwBSU">9780765617613</bdi></a>.</cite><span about="#mwt48" class="Z3988" id="mwBSY" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Earth+Day&amp;rft.btitle=Culture+Wars%3A+An+Encyclopedia+of+Issues%2C+Viewpoints%2C+and+Voices&amp;rft.place=Armonk%2C+N.Y.&amp;rft.pages=148&amp;rft.pub=M.E.+Sharpe&amp;rft.date=2010&amp;rft.isbn=9780765617613&amp;rft.aulast=Mink&amp;rft.aufirst=Nicolaas&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DvRY27FkGJAUC&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+22"></span></span>