Sir Richard Branson interview on plastics and the environmental damage they cause

The speaker discusses their strategy of lobbying various governments, including the Trump administration, to advocate for their case. They emphasize the importance of presenting the scientific merits of their argument and express confidence in their approach, despite challenges. The conversation concludes with expressions of gratitude.

What are the scientific merits mentioned by the speaker?

What does the speaker mean by 'knocking on an open door'?