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</html><thumbnail_url>https://www.klyster.nl/wp-content/uploads/2021/06/World-Cleanup-day.jpg</thumbnail_url><thumbnail_width>1441</thumbnail_width><thumbnail_height>961</thumbnail_height><description>In september is het weer tijd voor de grootste wereldwijde opruimactie van het jaar. Met 180 landen en meer dan 20 miljoen mensen ruimen wij onze planeet op. Plastic Soup Foundation roept leerlingen en docenten op&#xA0;woensdag 15 september om mee te doen met de scholen editie. Samen gaan wij niet alleen voorkomen dat het zwerfafval [&hellip;]</description></oembed>
