Paris Mayor Anne Hidalgo visited Los Angeles on Monday to meet with L.A. Mayor Eric Garcetti about the upcoming Olympic Games and both cities' sustainability goals. She also spoke to USC students at a roundtable discussion hosted by the USC Center on Public Diplomacy.

Paris is set to host the Games in 2024 while L.A. will host the Games in 2028. Garcetti and Hidalgo discussed ways to make the process more sustainable, she said in an interview with Annenberg News.

"We have a lot to share because these Olympic Games in Paris and L.A. will be the first Olympic Games [that are] very aligned with the Paris Agreement about climate change," Hidalgo said, referencing the Paris Climate Accords. President Trump withdrew the United States from the agreement in June 2017, saying it was disadvantageous to American workers.

Hidalgo stressed the importance of taking action on climate change immediately.

"We are working together about climate change to say that we have to do [something] now, not tomorrow," she said. "We are working for a young generation. We are here in L.A., tomorrow in San Francisco, to do that. To … convince all the people who think that we can wait. We cannot wait."

Hidalgo and Garcetti traveled to San Francisco on Wednesday to attend the Global Climate Action Summit, which runs from Sept. 12 to Sept. 14. The event is sponsored by C40 Cities, a global network of large cities that are committed to combating climate change through policy in their cities.

Hidalgo is the chair of C40 while Garcetti serves as one of 10 vice chairs on the Steering Committee. The summit is to focus on five key areas: healthy energy systems, inclusive economic growth, sustainable communities, land and ocean stewardship and transformative climate investments.

Garcetti and Hidalgo spoke in a joint press conference on Tuesday, during which Garcetti said he is honored to be able to work with Hidalgo.

"I've been so blessed to have somebody I've collaborated with so closely on the Olympics, on sustainability and saving this planet, on security, on technology and the future," Garcetti said. "This is not just a great leader of Paris [or] a great French leader, but a great global leader that I'm so proud to stand beside today."