COVID-19 also slowed U.S. emissions performance for 2020. According to a study published in May in Nature Climate Change, global CO2 emissions decreased by about 17% in the first four months of 2020 compared to the previous year. The largest declines were due to sharp declines in the aviation and ground transportation sector. Another paper published in October in Nature Communications noted that CO2 emissions began to rise again in May and June 2020, resulting in a reduction in global emissions of about 9% compared to 2019. Eri Saikawa, an environmental researcher at Emory University who was not involved in either study, says that the fact that COVID-19 cuts were the biggest factor in reducing emissions is rather a dark story. «We really need to do everything we can to reduce [emissions],» she says. COVID can`t do that. If the federal government continues to ignore climate change after the end of the pandemic, grassroots movements could put pressure on local governments to move forward on their own, she adds. Under the agreement, the United States would have to wait until one month after its intention to reintegrate into its country before formally joining, although it would lose some of the privileges of the short time the country left the agreement; they could not, for example, attend important meetings until they were members.  According to The Rhodium, the 2019 decline was due to a nearly 10% drop in emissions from the energy sector, which Rhodium says is the biggest decline in decades. There are also serious legal and constitutional issues. Foreign leaders in Europe, Asia and around the world should have no more to say about the U.S.
economy than our own citizens and their elected representatives. That is why our withdrawal from the agreement is a reaffirmation of American sovereignty. (Applause) Our constitution is unique among all the nations of the world, and it is my supreme commitment and the greatest honor to protect them. And I will. If the withdrawal is effective, the United States will be the only UNFCCC member states that have not signed the Paris Agreement. At the time of the initial announcement of the withdrawal, Syria and Nicaragua were also not present; However, both Syria and Nicaragua have ratified the agreement, so the United States is the only UNFCCC member state that intends not to be a contracting party to the agreement.  «It is really hard to imagine that other countries, in terms of ambition and leadership, will solve the climate crisis if the United States breaks away from this agreement,» Moore said. Despite this large number of political returns, the numerical political returns implemented and planned under the Trump administration will mean that greenhouse gas emissions will be only 3% (186 MtCO2e) higher than the CTU projection in 2030, since this policy is still in effect. The CTU`s overall projection for 2030, including taking into account the implementation of Trump`s returns, is now 2% lower than we estimated when Trump took office in 2016, down 13% from 2005 to 2030 levels.