More than 130 countries are expected to sign the landmark agreement to tackle climate change next week.
They will attend the signing ceremony at the UN headquarters on 22nd April, with COP21 President Segolene Royal and Executive Secretary of the UN Framework Convention on Climate Change (UNFCCC) also present.
The Paris agreement sets a collective goal of keeping global warming below 2°C compared to pre-industrial times and to limit temperature rise to 1.5°C.
The UNFCCC stated: “A country’s signature on the agreement initiates the critical domestic process, on which depends its final entry into force.
“This process takes many separate forms and can be rapid or lengthier, depending on each country’s domestic practices. The outcome may be countries’ instruments of ratification, acceptance, approval or accession.”
The US and China confirmed their attendance earlier this month.
The UN is also urging people to starting planting a tree each to celebrate the day.
Ms Figueres said: “Planting, hugging or sketching a tree to mark the signing of the Paris Agreement and to celebrate Earth Day is an expression of solidarity, love and hope”.
“The Paris Agreement, if fully implemented, offers a prospect of a far better world for billions of people. Conserving, restoring and extending the Earth’s natural or nature-based infrastructure including forests will be a big part of its long term success and long term goal.”