A man wearing a facemask walks on a street beside the CCTV building in Beijing in a hazy day in April. [Photo /Agencies]

I see four essential elements for Paris to be a success: durability, flexibility, solidarity and credibility.

First, durability. Paris must provide a long-term vision consistent with a below 2 degrees trajectory, and send a clear signal to markets that the low-carbon transformation of the global economy is inevitable, beneficial and already under way.

Second, the agreement must provide flexibility so it does not need to be continually renegotiated. It must be able to accommodate changes in the global economy and strike a balance between the leadership role of developed countries and the increasing responsibilities of developing countries.

Third, the agreement must demonstrate solidarity, including through financing and technology transfer for developing countries. Developed countries must keep their pledge to provide $100 billion a year by 2020 for adaptation and mitigation alike.

Fourth, an agreement must demonstrate credibility in responding to rapidly escalating climate impacts. It must include regular five year cycles for governments to assess and strengthen their national climate plans in line with what science demands. Paris must also include transparent and robust mechanisms for measuring, monitoring and reporting progress.

The UN stands fully ready to support countries in implementing such an agreement.

A meaningful climate agreement in Paris will build a better today-and tomorrow. It will help us end poverty. Clean our air and protect our oceans. Improve public health. Create new jobs and catalyze green innovations. It will accelerate progress towards all of the Sustainable Development Goals. That is why I care so deeply about climate change.

My message to world leaders is clear: success in Paris depends on you. Now is the time for common sense, compromise and consensus. It is time to look beyond national horizons and to put the common interest first. The people of the world-and generations to come-count on you to have the vision and courage to seize this historic moment.

The writer is Secretary-General of the United Nations