I'm similarly concerned about the horrible tiny rubber pellets used in latest-generation astroturf pitches. IIRC they used to be made from used tyres but now ar

I'm similarly concerned about the horrible tiny rubber pellets used in latest-generation astroturf pitches. IIRC they used to be made from used tyres but now aren't - does that just mean they're processed? Where does the rubber come from and where does it go afterwards?