Emmanuel Macron has said that the world is “losing the battle” against climate change and issued a plea to the leaders of wealthy countries: “We’re not moving quick enough. We all need to act.”

Mr Macron was speaking at the One Planet summit in Paris, a meeting of 50 countries to which the US President was not invited.

But in a light-hearted nod to Donald Trump, who has called climate change a “hoax”, the tag line for the summit was “Make Our Planet Great Again”.

Mr Macron said the US was not willing to “join the club” on combating climate change, he told Time. As part of the summit, 18 mostly US-based scientists will win paid opportunities to live and conduct climate-related research in Europe, away from the climate scepticism of Mr Trump.

Other attendees to the summit included Mexican President Enrique Pena Nieto, Theresa May and the secretary-general of the United Nations, Antonio Guterres.

France announced a raft of 12 non-binding commitments, from a $300m pledge to fight desertification to accelerating the transition towards a decarbonised economy. But there was no headline promise likely to reassure poor nations on the sharp end of climate change that they will be better able to cope.

Developed countries have pledged to provide $100bn (£75bn) a year to poorer countries, every year after 2020 – when the Paris Agreement, a global accord to curb greenhouse gas emissions and limit global warming to 2C, comes into force.

The funds were supposed to go towards adapting poorer countries’ infrastructures and economies to be more climate resilient, particularly in the event of a natural disaster. But specific details about financial pledges did not make it into the main text of the Paris Agreement in 2015, as governments called for flexibility.

Barack Obama jokes 'Thanks, Obama' when talking about climate change progress

Now, there are fears that countries are not getting even close to that figure for the first year. The Organisation for Economic Cooperation and Development (OECD) estimates only about $68bn (£51bn) has been collected.

Also in focus is how public and private financial institutions can mobilise more money and how investors can pressure corporate giants to shift towards more ecologically friendly strategies.

More than 200 institutional investors with $26 trillion in assets under management said they would step up pressure on the world’s biggest corporate greenhouse gas emitters.

Part of the reason to keep up momentum on fighting climate change is the vacancy in action and financing left by the US government under Mr Trump.

10 photographs to show to anyone who doesn't believe in climate change Show all 10 1 /10 10 photographs to show to anyone who doesn't believe in climate change 10 photographs to show to anyone who doesn't believe in climate change A group of emperor penguins face a crack in the sea ice, near McMurdo Station, Antarctica Kira Morris 10 photographs to show to anyone who doesn't believe in climate change Floods destroyed eight bridges and ruined crops such as wheat, maize and peas in the Karimabad valley in northern Pakistan, a mountainous region with many glaciers. In many parts of the world, glaciers have been in retreat, creating dangerously large lakes that can cause devastating flooding when the banks break. Climate change can also increase rainfall in some areas, while bringing drought to others. Hira Ali 10 photographs to show to anyone who doesn't believe in climate change Smoke – filled with the carbon that is driving climate change – drifts across a field in Colombia. Sandra Rondon 10 photographs to show to anyone who doesn't believe in climate change Amid a flood in Islampur, Jamalpur, Bangladesh, a woman on a raft searches for somewhere dry to take shelter. Bangladesh is one of the most vulnerable places in the world to sea level rise, which is expected to make tens of millions of people homeless by 2050. Probal Rashid 10 photographs to show to anyone who doesn't believe in climate change Sindh province in Pakistan has experienced a grim mix of two consequences of climate change. “Because of climate change either we have floods or not enough water to irrigate our crop and feed our animals,” says the photographer. “Picture clearly indicates that the extreme drought makes wide cracks in clay. Crops are very difficult to grow.” Rizwan Dharejo 10 photographs to show to anyone who doesn't believe in climate change Hanna Petursdottir examines a cave inside the Svinafellsjokull glacier in Iceland, which she said had been growing rapidly. Since 2000, the size of glaciers on Iceland has reduced by 12 per cent. Tom Schifanella 10 photographs to show to anyone who doesn't believe in climate change A river once flowed along the depression in the dry earth of this part of Bangladesh, but it has disappeared amid rising temperatures. Abrar Hossain 10 photographs to show to anyone who doesn't believe in climate change A shepherd moves his herd as he looks for green pasture near the village of Sirohi in Rajasthan, northern India. The region has been badly affected by heatwaves and drought, making local people nervous about further predicted increases in temperature. Riddhima Singh Bhati 10 photographs to show to anyone who doesn't believe in climate change A factory in China is shrouded by a haze of air pollution. The World Health Organisation has warned such pollution, much of which is from the fossil fuels that cause climate change, is a “public health emergency”. Leung Ka Wa 10 photographs to show to anyone who doesn't believe in climate change Water levels in reservoirs, like this one in Gers, France, have been getting perilously low in areas across the world affected by drought, forcing authorities to introduce water restrictions. Mahtuf Ikhsan

The US withdrew a $2bn pledge to the Green Climate Fund, one of the myriad pots set up for developing countries to receive aid money.

In June, Mr Trump ordered the start of the official withdrawal of the US from the Paris Agreement, after former President Barack Obama was obliged to use an executive order to join the deal in 2016 to bypass climate deniers in Congress.

The US remains the only country not in the Paris Agreement after previous holdouts Nicaragua and Syria joined the rest of the world.

And the US actively promoted the use of fossil fuels at a UN climate change meeting last month.

Industry representatives from coal, oil, gas and nuclear power companies like Peabody Energy, nuclear engineering firm NuScale Power, and Tellurian, a liquefied natural gas exporter, were prominently featured during the event.

During the panel, Mr Trump’s international energy issues adviser George D Banks said it was “controversial only if we chose to bury our heads in the sand”.

“Without question, fossil fuels will continue to be used, and we would argue that it’s in the global interest to make sure when fossil fuels are used that they be as clean and efficient as possible,” Mr Banks said.

However, the US private sector and state governments – like Governor Jerry Brown representing California – have not been left out of the One Planet summit.