France Wednesday banned two citizens' rallies planned for a crunch climate conference due to open in Paris just two weeks after terror attacks killed 129 people in the French capital.

Climate activists reacted with a mix of disappointment and understanding and vowed to find alternative ways to make their voice heard at the summit tasked with delivering a climate rescue pact.

Rallies to beat the drum for concerted political action against global warming had been planned for November 29, the day before some 120 heads of state and government are meant to open the summit, and December 12, the day after it closes.

"The situation created by the odious attacks of November 13, and the investigations under way since then, require that security conditions be reinforced," French Foreign Minister Laurent Fabius, who will preside over the summit, said in a statement.

"To avoid any additional risk, the government has decided not to authorise climate marches in public places in Paris and in other French cities on November 29 and December 12."

Green groups urged people around the world to join the other 2,173 events being planned worldwide as part of a Global Climate March on November 28 and 29.

"Now it's even more important for people everywhere to march on the weekend of November 29th on behalf of those who can't, and show that we are more determined than ever to meet the challenges facing humanity with hope, not fear," said Emma Ruby-Sachs of campaign group Avaaz.

"The government can prohibit these demonstrations, but it cannot stop the mobilisation and it won't prevent us strengthening the climate movement," added Nicolas Haeringer of 350.org.

- 'Difficult' choice -

Fabius said the decision had been "difficult" and was sure to disappoint many, "but in the current context, security requirements take priority."

Other climate gatherings in spaces that are "enclosed and easily secured" will go ahead, he added.

The French government has said it will not "give in" to terrorism and insists the long anticipated conference will go ahead.

The stakes are high: 195-nations gathered under the UN climate forum have set themselves the task of inking a pact to curb greenhouse gas emissions blamed for dangerous levels of climate change.

About 40,000 delegates, journalists, observers, NGOs and other participants are accredited for the November 30-December 11 marathon negotiation.

A security source told AFP that 5,000-odd police and military police would be needed to secure the November 29 rally, and that too in the midst of a national state of emergency and massive anti-terror deployment

The march had been planned to start at Place de la Republique square, very close to the scene of Friday's restaurant and bar shootings.

Climate NGOs said they would discuss possibilities with the French authorities for an alternative, safe gathering on November 29.

"For those who were planning to travel to Paris, still come and join us, and together we'll find a way to take action together," said Haeringer.

"We will find new, imaginative ways to ensure our voices are heard in the UN conference centre and beyond," said Jean Francois Julliard of Greenpeace France.

EU to push illegal firearms crackdown after Paris attacks
Brussels (AFP) Nov 18, 2015 - The European Union said Wednesday it will push through plans to tackle the trade in illegal firearms, ahead of a crisis meeting of interior ministers in Brussels following the Paris attacks.

EU Migration Commissioner Dimitris Avramopoulos also urged member states to make better use of intelligence-sharing tools to protect Europe's borderless Schengen area, which has come under scrutiny after the attacks.

"We decided to speed up things in a matter of days," Avramopoulos told a news conference.

"We will soon present a communication with concrete actions to tackle illegal firearms trafficking and explosives. We need actions to protect our citizens from the harm caused by smuggled Kalashnikovs."

Brussels also aims to have agreement by the end of the year on a controversial plan for the US-style sharing of air passenger name records, regarded as a key step for maintaining security within the passport-free Schengen zone, he said.

France requested the emergency meeting of interior ministers in the wake of Friday's carnage in Paris in which 129 people were killed in a gun and suicide bomb rampage claimed by the Islamic State group.

The fact that several of the attackers were from Belgium and the discovery of a Syrian passport at one of the Paris attack sites have also raised questions about Schengen, which is already under pressure from the migration crisis.

But Avramopoulos insisted that Schengen would survive, adding that it was up to EU states to make use of intelligence-sharing provisions to track Islamists travelling to fight in the Middle East.

"If we make full use of the tools given to us by Schengen our external borders will be protected in a more efficient way," he said.

"We don't intend to open a discussion on Schengen's future. Schengen is the greatest achievement of European integration."