Harvard University President Drew Gilpin Faust speaks at Tsinghua University in Beijing, March 17, 2015. [Photo/IC]

The Harvard president told students at one of China's most prestigious universities Tuesday that academic institutions must be unfettered places where every topic can be raised and every question asked to help tackle challenges such as climate change.

The comments by Drew Gilpin Faust were part of a 30-minute speech at Beijing's Tsinghua University on climate change in which she urged universities in the two countries to collaborate on research and on teaching the next generation how to deal with climate change.

"Knowledge emerges from debate, from disagreement, from questions, from doubt, from recognizing that every path must be open because any path might yield an answer," Faust said.

Her speech at the alma mater of Chinese President Xi Jinping came one day after she met Xi for discussions on US-China cooperation in higher education and the threat of climate change.

"Universities must be places where any and every topic can be broached, where any and every question can be asked," she told the faculty and students of Tsinghua. "Universities must nurture such debate because discoveries come from the intellectual freedom to explore that rests at the heart of how we define our fundamental identity and values."??

This is Faust's second trip to Tsinghua University as Harvard's president. During her previous visit to the school in 2008, she spoke on the value of higher education as "illuminating one's bright virtue."