Negotiators of the agreement stated that the INDCs presented at the time of the Paris conference were insufficient and found that „the estimates of aggregate greenhouse gas emissions in 2025 and 2030 resulting from the planned contributions at the national level are not covered by the least expensive scenarios of 2oC, but lead to a projected level of 55 gigatons in 2030.“ and acknowledges that „much greater efforts to reduce emissions will be needed to keep the increase in the global average temperature below 2 degrees Celsius, by reducing emissions to 40 gigatonnes or 1.5 degrees Celsius.“  [Clarification needed] The agreement recognizes the role of non-partisan stakeholders in the fight against climate change, including cities , other sub-national authorities, civil society, the private sector and others. While formal adherence to the agreement is simple, the biggest challenge for a Biden administration would be to present a new U.S. NDC, widely seen as ambitious and credible. In the agreements adopted in Copenhagen in 2009 and Cancun in 2010, governments set a target of keeping global temperature increases below 2 degrees Celsius above pre-industrial levels. The Paris Agreement reaffirms the 2-degree target and insists that the increase be limited to 1.5 degrees Celsius. The agreement also sets two other long-term mitigation objectives: first, a peak in emissions as soon as possible (recognizing that it will take longer for developing countries); a goal of net neutrality of greenhouse gases („a balance between anthropogenic emissions from sources and distance by wells“) in the second half of the century. Indeed, research shows that the cost of climate activity far outweighs the cost of reducing carbon pollution. A recent study suggests that if the United States does not meet its climate targets in Paris, it could cost the economy up to $6 trillion in the coming decades. A lack of compliance with the NPNs currently foreseen in the agreement could reduce global GDP by more than 25% by the end of the century. Meanwhile, another study estimates that achieving – or even exceeding – the Paris targets by investing in infrastructure in clean energy and energy efficiency could have great benefits globally – about $19 trillion. If the United States joined the agreement, it would be technically necessary to implement an NDC within 30 days.
President Trump is pulling us out of the Paris climate agreement. Negotiations on the Paris regulatory framework at COP 24 proved to some extent to be more difficult than those that led to the Paris Agreement, as the parties faced a range of technical and political challenges and, in some respects, applied more to the development of the general provisions of the agreement through detailed guidelines. Delegates adopted rules and procedures on mitigation, transparency, adaptation, financing, periodic inventories and other Paris provisions. However, they have failed to agree on rules relating to Article 6, which provides for voluntary cooperation between the parties in the implementation of their NDCs, including by applying market-based approaches. 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. Many countries have stated in their INDCs that they intend to use