Water, Water

Join host and moderator Neil deGrasse Tyson and his panel of experts for a lively discussion about the past, present, and future of water on Earth. Earth is the only place in our solar system with liquid water on its surface. Even though water makes up only 0.03 percent of the Earth’s total mass, it covers 70 percent of the planet’s surface. Where did this water come from? Why is it mostly in liquid form? How much of it is drinkable and how vulnerable is this valuable resource? Will we ever run out? Will wars of the future be fought over access to it? Will future generations harness water from space? Is water essential to all life in the universe—or just to life on Earth?