sign:
https://images.freeimages.com/images/premium/previews/5397/53979672-weathered-metallic-placard-with-danger-polluted-water-text-vecto.jpg

Boy:
https://ssl.c.photoshelter.com/img-get2/I0000rnVsdcC5JuI/fit=1000x750/MALI-dogon-boy-carrying-water.jpg

Lake:
https://upload.wikimedia.org/wikipedia/en/c/c2/Lakeparramatta.jpg