Not the person you responded to, but I would totally be onboard taxing companies in a way that more accurately reflects their environmental impact. As it stands products are artificially cheap because we're not factoring in environmental sustainability.
Wireless earbuds are going to be filling landfills soon. They have become near unrepairable as of late and once the batteries inside barely last 15 min, people will just trash them and get new ones. At least wired headphones could be used for decades without issue.
A pair of AirPods weighs the same as two ordinary plastic bags, the grocery store kind.
Lithium? About a gram of lithium in a disposable AA lithium battery. About 0.015 grams per AirPod proper, and another 0.16 grams in the case. So call it 0.2 grams, or when you toss five (5) AirPods with their cases, that's as much lithium as one (1) disposable AA battery.