Straws and other plastics cause harm to marine life in many ways. Birds, fish and other sea life consume plastics accidentally or when they mistake it for food. Plastics don't biodegrade. They break down into smaller and finer, microscopic pieces. When plastics break down, they produce bisphenol A (BPA) which interferes with reproductive systems in marine life. It also produces styrene monomer which is a suspected carcinogen.
According to the National Park Service, Americans use 500 million drinking straws daily! So, on National Skip the Straw Day that's potentially 500 million fewer straws that don't end up in landfills or the ocean.
We can give you all sorts of other statistics to convince you to Skip the Straw on National Skip the Straw Day (and on other days), but we would rather show you how.