However, if the United States felt that the goals it had set for 2015 were too ambitious, it could have simply changed them, rather than withdrawing completely from the Paris agreement under the rules of the agreement. It is rare that there is a consensus among almost all nations on a single subject. But with the Paris agreement, world leaders agreed that climate change was driven by human behaviour, that it was a threat to the environment and to humanity as a whole, and that global action was needed to stop it. In addition, a clear framework has been put in place for all countries to make commitments to reduce emissions and strengthen these measures over time. Here are some important reasons why the agreement is so important: Luke Kemp of the Fenner School of Environment and Society at the Australian National University wrote in a commentary for Nature that “withdrawal is unlikely to change U.S. emissions” because “U.S. greenhouse gas emissions are disconnected from international legal obligations.” He added, however, that this could hamper efforts to mitigate climate change if the United States ceases to contribute to the Green Climate Fund. Kemp said the impact of a U.S. exit could be good or bad for the Paris agreement, because “an unseraunted American president can do more damage inside than outside the agreement.” Finally, “a withdrawal could also make the United States a climate pariah and provide China and the EU with a unique opportunity to take control of the climate regime and significantly strengthen their international reputation and soft power.”  On the other hand, there is the belief that China is not in a position to take control of the climate regime and that it should instead “help rebuild global leadership by replacing the Sino-Chinese G2 partnership with a climate 5 (C5) partnership comprising China, the EU, India, Brazil and South Africa.”  However, even if the United States decided to withdraw from the agreement, this would have implications for outsourcing and the implementation of a few months. Although the agreement was signed in December 2015, the treaty did not enter into force until November 4, 2016, 30 days after ratification by at least 55 countries representing 55% of global emissions. The main objective of the agreement is to keep the increase in the average global temperature at a level well below 2oC above pre-industrial levels, including by reducing greenhouse gas emissions. The agreement is different from the 1997 Kyoto Protocol, the last UNFCCC amendment, which was widely adopted, as no annex is established to reduce the liability of developing countries.
On the contrary, emission targets have been negotiated separately for each nation and must be implemented voluntarily, so U.S. officials view the Paris agreement as an executive agreement rather than a legally binding agreement.