The Aspiration Zero card is made from approximately 84% corn-based PLA (a sustainable plastic substitute). PLA bioplastic has a much smaller carbon footprint than the traditional fossil-based plastic used in most credit cards.
As of today, no solution exists for payment card recycling. Most cards end up being incinerated; while PVC generates toxic fumes during incineration, PLA does not. Additionally, looking towards a future when processes exist to separate PLA from non-biodegradable aspects of a card (magnetic stripe and chip, for example), the PLA itself would be biodegradable/compostable. (Source: https://www.thalesgroup.com/en/markets/digital-identity-and-security/banking-payment/cards/eco-friendly-credit-card)