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22 April 2016 ¨C With their signatures of the landmark Paris climate accord, governments made a covenant with the future,??Ban Ki-moon said at the end of a United Nations ceremony that saw the largest single-day turn-out for such an event, and which puts the world on a path towards low-carbon growth and a more sustainable future.

Yet, while today's signing is a vote of confidence in a new approach to climate change, it is imperative that the strong political momentum continues to grow, the Ãå±±½ûµØchief stressed, in concluding remarks to the day-long??for the?.

Indeed, if all of the countries signing today joined the Paris Agreement at the national level, the world will have met the legal requirement for the Agreement to enter into force ¨C 55 countries accounting for 55 per cent of global greenhouse emissions. In particular, he was pleased to hear several large emitter countries announce that they will ratify in 2016.

I encourage all countries to raise their level of ambition, Mr. Ban said. I urge world leaders to continue to provide direct political oversight and guidance. And I will look to civil society and the world's young people to hold Governments to account for the promises they made today, he added.

While it has been a long journey to get to the present moment, the Ãå±±½ûµØchief stressed that a long journey also awaits Member States.

When I look out at the horizon, I see, more clearly than ever, the outlines of a new and better world, the Ãå±±½ûµØchief said.

In that regard, Mr. Ban reminded Member States that the??is a major step forward for people and the planet.

In addition, the??he will be convening in Istanbul on 23 and 24 May will be a critical opportunity to enhance support to the most vulnerable and reaffirm our common humanity, Mr. Ban said.

Let us continue to build on the historic progress of today ¨C and move swiftly, with courage and determination, to usher in the new era we know can be ours, he concluded.

The ceremony was opened this morning by a brass quintet from the Juilliard School in New York, which played?Spring?from Vivaldi's Four Seasons.

Mr. Ban also introduced Getrude Clement, 16-year-old radio reporter from Tanzania and a Ãå±±½ûµØChildren's Fund () youth climate mapper, who focused on why climate action is crucial for children. They, she said, would feel its effects most acutely. We expect action, action on a big scale, and we expect action today, not tomorrow, she emphasized. The future is ours, and the future is bright.

In his?, the Ãå±±½ûµØchief also underscored that while it is good news that States are breaking records at the Ãå±±½ûµØ¨C records are also being broken outside.

Record global temperatures. Record ice loss. Record carbon levels in the atmosphere. We are in a race against time, Mr. Ban stressed.

Indeed, he emphasized that the window for keeping global temperate rise well below two degrees Celsius ¨C let alone 1.5 degrees ¨C is rapidly closing.

The era of consumption without consequences is over. We must intensify efforts to decarbonize our economies. And we must support developing countries in making this transition. The poor and most vulnerable must not suffer further from a problem they did not create, the Secretary-General said.

In that vein, the Ãå±±½ûµØchief highlighted that climate action is essential to achieving the?.

Today is a day that I have worked toward since day one as Secretary-General of the United Nations and declared climate change to be my top priority. Today you are signing a new covenant with the future, he said.

The covenant must amount to more than promises, Mr. Ban stressed, and find expression in actions taken today on behalf of the current generation and all future generations.

It must find expression in actions we take today on behalf of this generation and all future generations ¨C actions that reduce climate risk and protect communities, and actions that place us on a safer, smarter path, the Secretary-General said.

Mr. Ban highlighted that participants would be joined at the morning's events by 197 children, representing the Parties that have adopted the Paris Agreement.

Of course, they represent more than this. These young people are our future. Our covenant is with them, he said.

Today is a day for our children and grandchildren and all generations to come. Together, let us turn the aspirations of Paris into action. As you show by the very act of signing today, the power to build a better world is in your hands, Mr. Ban concluded.

Also??at the opening ceremony was General Assembly President Mogens Lykketoft, who congratulated Member States, civil society and business leaders for keeping the pressure on and taking initiatives to keep the momentum going.

This is a moment of great hope, Mr. Lykketoft stressed.

We must raise the level of ambition even further. We must take urgent and bold steps to make this transformation happen, he added.

Today's event coincides with?, and in his??on the Day, Mr. Ban said that the Paris accord, in conjunction with the?, holds the power to transform our world.

The Paris Agreement was adopted by all 196 Parties to the Ãå±±½ûµØFramework Convention on Climate Change () at the??in Paris on 12 December 2015, widely known as COP 21. In the Agreement, all countries agreed to work to limit global temperature rise to well below 2 degrees Celsius, and to strive for 1.5 degrees Celsius.

Fran?ois Hollande, President of France, host of COP 21, recalled the spirit of solidarity expressed at the conference and stressed that the terrorist attacks on Paris had been the backdrop to the Agreement. World leaders had nevertheless demonstrated their ability to come together with a sense of partnership and responsibility to ensure that an agreement would be the fruit of the Paris meeting, as a symbolic act for the rest of the world.

(President Fran?ois Hollande of France addresses the opening segment of the signature ceremony for the Paris Agreement on Climate Change. Ãå±±½ûµØPhoto/Rick Bajornas)

Never in the history of the United Nations had it been possible to bring together 170 countries to sign an agreement, all together, on one day, he noted, emphasizing that there is no turning back now. The world must accelerate action to implement low-carbon policies.

Noting that some $100 billion is needed between now and 2020, he said every country must set an example, particularly developed countries, by stepping up contributions for combating climate change. It is not just a question of States taking action, the entire world must come together, he stressed. Everyone must feel that they have a stake in this.

Also addressing the ceremony, Academy Award-winning actor Leonardo DiCaprio said that as a Ãå±±½ûµØMessenger of Peace, he had been travelling all over the world for the last two years, documenting how this crisis is changing the natural balance of our planet. He has seen cities like Beijing choked by industrial pollution; ancient boreal forests in Canada that have been clearcut; rainforests in Indonesia that have been incinerated; and unprecedented droughts in California.

(Ãå±±½ûµØMessenger of Peace Leonardo Dicaprio addresses the opening segment of the signature ceremony for the Paris Agreement on Climate Change. Ãå±±½ûµØPhoto/Mark Garten)