Thematic ETFs - What's Next for the ETF Space?

In the US, if you look at assets in thematic ETFs five years ago, the number was roughly $5 billion. At the end of 2021, we're talking about $120 billion in a UM, very significant pattern coming out of Europe as well. So I know you obviously think thematics have a lot of room to grow. What sort of directions do you think thematicETFs are going to head into? What's next for the investment space?