Actor and philanthropist Leonardo DiCaprio was spotted in a meeting with Secretary of State John Kerry on Monday, where they discussed solutions on how to curb the effects of global warming at the climate change summit in Paris.

People Magazine reports DiCaprio, who has been appointed as United Nation's Messenger of Peace for the Climate, appeared focused on his conversation with Kerry, who pushed for environmental reform during his time in the senate.

Both DiCaprio and Kerry joined hundreds of world leaders for the Paris Climate Conference also known as COP21 (Conference of Parties) which started on November 30 and will end on December 11.

The Revenant actor participated in the summit with plans of sitting down with top climate change officials.

Kerry tweeted a photo of their meeting, writing, "Great to see my friend @LeoDiCaprio at #COP21 -- one of the most committed advocates for our ocean and our planet."

DiCaprio replied to his tweet the following morning, saying, "Great seeing you, too. Thank you @JohnKerry for all you're doing at #COP21."

On Friday, DiCaprio spoke to various mayors from cities around the world at Paris City Hall. He was discussing about the possible solutions they could do to help prevent the threatening impact of global warming.

"Climate change is the most fundamental and existential threat to our species. The consequences are unthinkable and worse, it has the potential to make our planet unlivable," said DiCaprio.

"Our future will hold greater prosperity and justice when we are free from the grip of fossil fuels," the board member of World Wildlife Fund and Natural Resources Defense Council continued. "Now to get there, we must act. We must finally leave behind the inefficient technologies of another century and the business models that they have created."

In July, DiCaprio donated $15 million-worth of grants through the Leonardo DiCaprio Foundation to different conservation groups that aim to protect the environment and wildlife.