Some 150 world leaders from U.S. President Barack Obama to Prime Minister Enele Sopoaga of Tuvalu gathered in Paris on Monday to open a summit meant to secure the world’s most ambitious pact on climate change.

The full list of speakers is available here.

Below are select comments and quotes from the speakers:

U.S. PRESIDENT BARACK OBAMA:

“As the leader of the world’s largest economy and the second largest (greenhouse gas) emitter … the United States of America not only recognises our role in creating this problem, we embrace our responsibility to do something about it.”

He set out “one possible future” of unchecked global warming: “Submerged countries, abandoned cities, fields that no longer grow. Political disruptions that trigger new conflicts, leaving more floods of desperate people seeking sanctuary in nations not their own.”

CHINESE PRESIDENT XI JINPING:

“Tackling climate change is a shared mission for mankind … Let us join hands to contribute to the establishment of an equitable and effective global mechanism on climate change, work for global sustainable development at a high level and bring about new international relations featuring win-win cooperation.”

Xi said the climate talks must address economic differences between nations and allow different countries to develop their own solutions to the problem of global warming.