1. By 27 November 2021 , the Commission shall present a report to the European Parliament and to the Council, assessing the effectiveness of measures in Article 4(1a) at Union level, in combating littering, changing consumer behaviour and promoting waste prevention. If the assessment shows that the measures adopted are not effective, the Commission shall examine other possible ways to achieve a reduction in the consumption of lightweight plastic carrier bags, including the setting of realistic and achievable targets at Union level, and present a legislative proposal, if appropriate.
2. By 27 May 2017 , the Commission shall present a report to the European Parliament and to the Council, examining the impact of the use of oxo-degradable plastic carrier bags on the environment and present a legislative proposal, if appropriate.
3. By 27 May 2017 , the Commission shall assess the life cycle impacts of different possibilities to reduce the consumption of very lightweight plastic carrier bags, and present a legislative proposal, if appropriate.]