How is having a government-mandated charging port going to have a positive environmental impact, other than by having a mandate which forces everyone to stick with their current connectors and stop adopting new ones?

There is likely to be a grace period involving a pragmatic discussion, before any regulation is passed. It will revolve around adoption of USB-C as a common standard moving forward, rather than the knee-jerk reaction you are proposing. The Commission's powers are subject to strict limits when adopting 'Delegated acts' which cannot change the essential elements of the law and must define objectives, content, scope and duration of the delegation of power. In any event, the Parliament and Council may revoke the delegation or express their objections.

Thanks for the feedback, didn't intend to come across as knee-jerk. Its just that the idea of obsoleting every existing charger doesn't seem very environmentally friendly.