French President Francois Hollande assessed on Monday, the first day of an official visit to China, that Beijing's support is "crucial" for achieving a "global and ambitious agreement" at the UN climate conference in Paris.

"In China, in order to give Chinese authorities the opportunity to reach a global and ambitious agreement that would allow the planet to warm up to two levels," the president said at his arrival in Chongqing, an industrial city in the southwest of the country on Monday morning.

"Chinese support is crucial," he added. "The fight against global warming is a humanitarian issue, but also a significant economic challenge, what we call a green growth," Hollande said.

Following a delegation of over 40 chiefs of companies and several ministers (foreign affairs, ecology, finance), Hollande visited a Chinese-French water treatment company Tangjiaoto upon his arrival in Chongqing, illustrating bilateral co-operation in the area of ​​green growth.

Leader of Chinese economic development, Chongqing is facing great environmental challenges. It is one of the six industry bases in the country, particularly known for the automotive industry.

Hollande was on Tuesday in China to try to convince that country, key to combating global warming, to provide a firm boost to negotiations before the Paris Conference.

With 25 the world's greenhouse gas emissions, China is the world's first polluter on the planet.