Prince Charles launches plastics prize

The speaker expresses gratitude for the audience's presence and acknowledges their busy schedules. They discuss the challenges faced, such as the greenhouse effect, and the achievements made. The event is highlighted as significant, with hopes for future progress in addressing complex issues. The speaker hopes this gathering will be remembered as a pivotal moment for positive change.

What does the speaker express gratitude for in relation to the audience?

How does the speaker describe the issue being addressed in the speech?