The agreement comes after the administration of President Donald Trump said on Monday it filed paperwork to withdraw the United States from the Paris Agreement, the first formal step in a one-year process to exit the global pact to fight climate change.
The move is part of a broader strategy by Trump to reduce red tape on American industry, but comes at a time scientists and many world governments urge rapid action to avoid the worst impacts of global warming.
Speaking to reporters in Shanghai accompanying Macron who is on a state visit to China, a French presidential office official expressed regret at the U.S. move.
"We regret this and this only makes the Franco-Chinese partnership on the climate and biodiversity more necessary," the official, speaking on condition on anonymity, said.
"The text that will be signed tomorrow includes a paragraph on the irreversibility of the Paris agreement." Macron and Xi are due to hold a formal meeting in Beijing on Wednesday.
Macron is in Shanghai attending a major trade fair, where Xi will give the keynote address.