These barriers make environmental protocols an obvious goal for several critics, such as. B slow effects (due to the implementation of the Convention Protocol), the trend towards the lowest common denominator and the lack of monitoring and implementation. They can also be criticized for following a step-by-step approach, in which the principles of sustainable development indicate that environmental concerns must be addressed consistently. The IEA website is constantly reviewed and updated. A comprehensive review was carried out during 2017, with the addition of numerous bilateral agreements and a comprehensive update of the accession measures of all MEAs and a large number of REAs. .