As an AI language model, I cannot predict future events or provide real-time information beyond October 2021. Therefore, I cannot provide a list of the top environmentally friendly car companies in 2023.

However, as of the most recent data, some of the leading car companies in terms of producing environmentally friendly vehicles, such as electric or hybrid cars, include:

1. Tesla
2. Toyota
3. BMW
4. Mercedes-Benz
5. Nissan
6. Audi
7. Ford
8. Hyundai
9. Volkswagen
10. General Motors

Please note that this list is based on current information and could change in the future as more companies invest in eco-friendly technologies and as new players emerge in the market.