Every year more than 7,000 million of these capsules end up in the trash without being recycled. The problem is that since they contain organic material inside, the capsules cannot currently be recycled. This organic material - coffee grounds - presents a headache for recycling plants as they are unable to effectively separate the aluminum from the capsule.
Additionally, as of 2019 only 10% of the capsules put on the market were recycled. This translates to more than 6,930 million capsules ending up in landfills without being recycled around the globe.
Currently, there are few specialized recycling plants adapted for proper treatment of these capsules around the world with limited capacity. Transporting every used aluminum capsule from the different regions to those plants would result in very high costs - both financially and in terms of carbon footprint.
English 
Spanish