What image or picture triggered the curiosity of Al Gore regarding global warming when he was a student?

As a student, Al Gore was particularly struck by an image of the Earth taken from space, known as the "Blue Marble." This iconic photograph highlighted the planet's fragility and interconnectedness, sparking his curiOSity about environmental issues, particularly global warming. The visual representation of Earth as a small, vulnerable sphere in the vastness of space contributed to his awareness of the urgent need to address climate change.