President Obama was able to formally enshrine the United States in the agreement through executive measures because he did not impose new legal obligations on the country. The United States already has a number of instruments on the books, under laws already passed by Congress to reduce carbon pollution. The country officially joined the agreement in September 2016, after submitting its request for participation. The Paris Agreement was only able to enter into force after the formal accession of at least 55 nations representing at least 55% of global emissions. This happened on October 5, 2016 and the agreement came into force 30 days later, on November 4, 2016. In 1992, President George H.W. Bush joined 107 other heads of state at the Rio Earth Summit in Brazil to adopt a series of environmental agreements, including the UNFCCC framework, which is still in force today. The international treaty aims to prevent dangerous human intervention in the planet`s climate systems in the long term. The pact does not set limits on greenhouse gas emissions from individual countries and does not contain enforcement mechanisms, but establishes a framework for international negotiations on future agreements or protocols to set binding emissions targets. Participating countries meet annually at a Conference of the Parties (COP) to assess their progress and continue discussions on how best to combat climate change. The level of the NDC set by each country will determine the objectives of that country. However, the „contributions“ themselves are not binding under international law because of the lack of specificity, normative nature or language necessary to establish binding standards. In addition, there will be no mechanism to compel a country to set a target in its NDC on a specified date and not for an application if a defined target is not achieved in an NDC.   There will be only a „Name and Shame“ system  or as UN Deputy Secretary General for Climate Change, J. Pésztor, CBS News (US), a „Name and Encouragement“ plan.  Since the agreement has no consequences if countries do not live up to their commitments, such a consensus is fragile. A cattle of nations withdrawing from the agreement could trigger the withdrawal of other governments and lead to the total collapse of the agreement.  The delay is due to the complex rules introduced in the Paris Agreement to deal with the possibility that a future president of the United States will decide to withdraw the country from the agreement. (b) improving the ability to adapt to the negative effects of climate change and promoting resilience to climate change and the development of low greenhouse gas emissions so as not to endanger food production; On October 5, 2016, when the agreement reached enough signatures to cross the threshold, U.S. President Barack Obama said, „Even if we achieve all the goals… we will only get to part of where we need to go. He also said that „this agreement will help delay or avoid some of the worst consequences of climate change.“ It will help other nations reduce their emissions over time and set bolder goals as technology progresses, all under a strong transparency system that will allow each nation to assess the progress of all other nations.   How each country is on track to meet its obligations under the Paris Agreement can be tracked online continuously (via the Climate Action Tracker  and the climate clock).