Earth and Mars-One Wet, One Dry. Why? 

Presented by Dr. Donald Henderson of the Royal Tyrrell Museum of Palaeontology, February 8, 2024.
Earth and Mars both started as warm, wet planets 4.6 billion years ago. Billions of years later, Earth is still a warm, wet, biologically active planet, while Mars is cold, dry, and seemingly devoid of life. Dr. Henderson’s talk explores some of the reasons why this is the case.