During the debate , Ham advocated the legitimacy of a YEC model of the universe 's origins , while Nye cited observations from a variety of scientific fields to defend the scientific consensus that the Earth is approximately 4.5 billion years old .
During the debate , Ham talked about his model of the universe 's origins . Nye cited observations from a variety of scientific fields to defend the majority scientific consensus that the Earth is approximately 4.5 billion years old .