In the absence of an agreement, British freight companies have warned that there could be blockages at ports and that deliveries of key goods could be severely disrupted in the UK from 1 January. On 22 October 2019, the House of Commons agreed, by 329 votes to 299, to give a second reading to the revised withdrawal agreement (negotiated by Boris Johnson earlier this month), but when the accelerated timetable it had proposed did not receive the necessary parliamentary support, Johnson announced that the law would be overturned.   The agreement also provides for a transitional period that extends to 31 December 2020 and can be extended by mutual agreement. During the transitional period, EU legislation will continue to apply to the UK (including participation in the European Economic Area, the internal market and the customs union) and the UK will continue to contribute to the EU budget, but the UK will not be represented in EU decision-making bodies. The transition period will give businesses time to adapt to the new situation and the new era, so that the British and European governments can negotiate a new trade agreement between the EU and the UK.   The UK left the EU`s political structures on 31 January and will pause economically if an 11-month transitional period ends on 31 December. In the meantime, both sides are trying to reach a new trade deal, but talks have stalled. This book examines options for improving the compliance system under the Paris climate agreement, with the current focus. The research is based on two cases: the compliance mechanisms of the Montreal and Kyoto Protocols and their practical results. This book analyzed the different meanings of the concept of compliance mechanisms (CMs) and multilateral environmental agreements (MMA) in Chapter 3, on theories and two basic explanation models on compliance (Chapter 4), the development of MCs and traditional means restrictions (Chapter 5) and ISSUEs related to CMOs under the Kyoto and Montreal Protocols (Chapter 6). Based on the results, options for an improved compliance system under the Paris climate agreement are requested (Chapter 7). This book – provides a detailed understanding of compliance and existing compliance mechanisms (CMs), develops the current characteristics of CMs based on their case studies, contains the latest information on CMs and their case studies, examines options for improving the compliance system under the Paris climate agreement to identify current weaknesses. The agreement defines and provides the personal dimension of citizens, family members, border workers, host states and nationals.