Natural Resources Wales, the Welsh Government’s own advisers on the environment, has told the M4 Relief Road inquiry that the Welsh Government has not demonstrated that the project would comply with its statutory duty to promote sustainable development.  While accepting that new reens to replace those lost are satisfactorily designed, the NRW witness said that replicating the complex ecology of the SSSIs would be challenging.  NRW has also questioned the proposals to manage tidal flood risk over the lifetime of the road, a time of climate change.