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Around 269 million people worldwide use drugs each year. Often forgotten in this story is a problem of basic biology. What goes in must come out. Sewers are inundated with drugs that are excreted from the body, along with the broken down chemical components that have similar effects to the drugs themselves. Sewage treatment plants don’t filter these things out – they were never designed for it. A lot of sewage also finds its way into rivers and coastal waters untreated. Once in the environment, drugs and their byproducts can affect wildlife. In a recent study, researchers in the Czech Republic investigated how methamphetamine – a stimulant with a growing number of users worldwide – might be affecting wild brown trout.

Czech republicUnited kingdomMatt parkerUniversity of portsmouthSenior lecturerசெக் குடியரசுஒன்றுபட்டது கிஂக்டம்மேட் பார்க்கர்பல்கலைக்கழகம் ஆஃப் போரதிஸ்மௌத்மூத்தவர் விரிவுரையாளர்