The billionaire real-estate tycoon who said that global warming was invented by the Chinese may be having second thoughts on this topic.

Today, the president of France told Le Journal du Dimanche that U.S. president Donald Trump might reverse his decision to pull the United States out of the Paris climate agreement.

"We spoke in detail about the things that could make him come back to the Paris accord," Emmanuel Macron told the weekly paper.

Trump was recently in Paris for the annual July 14 Bastille Day celebrations.

In the past, Donald Trump has been called "climate crazy" by the activist group 350.org's director, May Boeve.

In June, Vox reported that Trump has tweeted his skepticism about climate change 115 times.

On one such occasion, Trump claimed that the planet is "freezing" and that "GW scientists are stuck in ice".

In 2012, Trump tweeted: "The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive."

One of Trump's first moves after becoming president in January was to sign executive orders advancing the Keystone XL and Dakota Access pipelines.

This came after he promised to "rescind all the job-destroying Obama executive actions including the Climate Action Plan".

Trump also pledged during the 2016 campaign to "cancel the Paris Climate Agreement and stop all payments of U.S. tax dollars to U.N. global warming programs".

In 2015, 197 countries reached an agreement in Paris to keep the average global temperature rise well below two degrees Celsius above pre-industrial times. They also declared a stated objective of limiting the increase to 1.5 degrees Celsius.

However, not everyone believes that this goal can be met, even if all the signatories achieve their stated targets.