You've probably seen that video of a straw being pulled out of a sea turtle's nose. It went viral in 2015, sparking a public outcry to say no to plastic straws! Over the years the campaign has gained traction and companies have taken notice. Starbucks says by 2020 it will eliminate plastic straws, pivoting to biodegradable straws and a newly designed lid. McDonald's UK, American Airlines, and Marriott Hotels have also announced similar changes. But, what makes plastic straws especially troublesome?