As the oceans warm, there's more humidity. More humidity, more latent heat of vaporization. This is the energy that powers thunderstorms and hurricanes.
The planet was probably the warmest during the Cretaceous.
The planet is warming up, even the USDA plant hardiness map was updated (I was in 6b now I'm 7a):
https://www.npr.org/2023/11/17/1213600629/-it-feels-like-im-...