ISO 14001 / Management Review

You can merge those registers in order to save time and documentation and afterwards, quantitatively analyze those risks to find out which are significant and address them.

Regarding the risks, you need not only to consider the environmental aspects in your EMS but also to your environmental legal requirements, feedback from your interested parties such as customers or employees and benchmarking your processes against other similar organizations. 

I recommend you to create a Process Aspect Chart where you can register and evaluate environmental aspects and risks associated to each process following your selected criteria (e.g. probability, reach of impact) - For the opportunities you can use another register. Here you can find an example - Process Aspect Chart: https://advisera.com/14001academy/documentation/process-aspects-chart/

These materials can help you to learn more about risks and environmental aspects:

- Article - ISO 14001 risks and opportunities vs environmental aspects: https://advisera.com/14001academy/blog/2016/06/06/iso-14001-risks-and-opportunities-vs-environmental-aspects/

- Enroll for free in this course – ISO 14001:2015 Foundations Course - https://advisera.com/training/iso-14001-internal-auditor-course/

- Book – The ISO 14001:2015 Companion - https://advisera.com/books/the-iso-14001-2015-companion/