What is meant by a ‘nature-based solution’ to coastal flood and erosion protection?

What is meant by a ‘nature-based solution’ to coastal flood and erosion protection?’. This should be no more than 250 words. The second part you answer one question of 7, you have to answer q5 What is meant by ‘managed realignment’? only. this 2nd part is for a presentation so you do not need references. you should reference in the first part. the second part should be written as a presentation script. you can include a couple of slides for the second part if you wish. I will also upload content to help with answering the questions. Key textbooks Web Link
Masselink, G. and Hughes, M.G. Introduction to coastal processes and geomorphology. Arnold. Latest edition.
Web Link
Coastal problems: geomorphology, ecology, and society at the coast / Viles H. and Spencer T.
Web Link
Coastal evolution : Late Quaternary shoreline morphodynamics / edited by R.W.G. Carter, C.D. Woodroffe
You can access these using my library login which I will provide after the writer is confirmed. You should also find your own literature on the topics.