The authors of the agreement set a withdrawal schedule that President Trump must follow – which prevents him from irreparably harming our climate. In addition, countries aim to « reach a global peak in greenhouse gas emissions as soon as possible. » The deal has been described as an incentive and engine for the sale of fossil fuels.   As a contribution to the objectives of the agreement, countries submitted comprehensive national climate action plans (nationally defined contributions, NDCs). These are not yet sufficient to meet the agreed temperature targets, but the agreement charts the way forward. John Shepherd, of the National Oceanography Centre at the University of Southampton, says the deal contains welcome aspirations, but few people know how difficult it will be to achieve the goals. The contributions that each country should make to achieve the overall target are determined by that country and called Nationally Determined Contributions (NDCs).  Article 3 requires that they be « ambitious », that they « represent progress over time » and that they be defined « with a view to achieving the objective of this Agreement ». Contributions must be reported every five years and registered by the UNFCCC Secretariat.  Each additional goal should be more ambitious than the previous one, called the « progress principle. »  Countries can work together and share their Nationally Determined Contributions […].