The EU and its member states are among the nearly 190 parties to the Paris Agreement. The EU formally ratified the agreement on 5 October 2016, allowing it to enter into force on 4 November 2016. In order for the agreement to enter into force, at least 55 countries representing at least 55% of global emissions had to file their ratification instruments. Another key difference between the Paris Agreement and the Kyoto Protocol is its scope. While the Kyoto Protocol distinguishes between Schedule 1 countries and those not annexed to Schedule 1, this branch is scrambled in the Paris Agreement, as all parties must submit emission reduction plans.  While the Paris Agreement continues to emphasize the principle of “common but differentiated responsibility and respective capabilities” – the recognition that different nations have different capacities and duties to combat climate change – it does not offer a specific separation between developed and developing countries.  It therefore appears that negotiators will have to continue to address this issue in future rounds of negotiations, although the debate on differentiation could take on a new dynamic.  The agreement stipulated that it would only enter into force (and therefore fully effective) if 55 countries responsible for at least 55% of global greenhouse gas emissions (according to a list drawn up in 2015) ratified, approved or ratified the agreement.   On April 1, 2016, the United States and China, which together account for nearly 40% of global emissions, issued a joint statement confirming that the two countries would sign the Paris climate agreement.
 175 contracting parties (174 states and the European Union) signed the agreement on the first day of its signing.   On the same day, more than 20 countries announced plans to join the accession as soon as possible in 2016. The ratification by the European Union has achieved a sufficient number of contracting parties to enter into force on 4 November 2016. As far as the national level is concerned, Article 4.27 of the agreement provides for the obligation to translate NPNs into a national implementation system (in France, the low-carbon national strategy8 is the Palestinian Authority`s instrument of implementation).