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Around the world, coastlines are constantly changing due to the power of waves, currents and tides. Coastal areas are also some of the most heavily populated and developed land areas in the world. So it\u2019s not hard to see how the natural process of coastal erosion can cause serious problems for us.

It\u2019s an issue that\u2019s been bothering CrowdScience listener Anne in Miami Beach, Florida. She can see the beach from her window and wonders why after every storm, several trucks arrive to dump more sand on it.

In this first of two programmes, CrowdScience visits Anne\u2019s home in south Florida and finds out how erosion threatens Florida\u2019s famous beaches. Caroline Steel speaks to geoscientist Dr Tiffany Roberts Briggs and hears why it\u2019s such a problem for this tourist-reliant state. Tiffany explains the delicate balance between natural processes and human infrastructure.

Meanwhile, the Caribbean island of Puerto Rico declared a state of emergency in April 2023 due to coastal erosion. Caroline witnesses the impacts of erosion first-hand, as Ruperto Chaparro shows her abandoned houses crumbling into the sea.

But how can we quantify the rate of erosion? Dr Kevian Perez in the Graduate School of Planning at University of Puerto Rico explains the methods they use to monitor Puerto Rico\u2019s coastlines, and how they are evaluating the effectiveness of different mitigation methods.

However, some of the methods used to protect coastal communities from the encroaching sea have done more harm than good. So what are the best ways to tackle this problem? That\u2019s what we\u2019ll be exploring in next week\u2019s programme.

Presenter: Caroline Steel \nProducer: Hannah Fisher \nEditor: Cathy Edwards \nProduction Co-ordinator: Liz Tuohy \nStudio Manager: Steve Greenwood and Bob Nettles

Featuring: \nDr Tiffany Roberts Briggs, Associate Professor at Florida Atlantic University \nRuperto Chaparro, Director of Sea Grant Programme, University of Puerto Rico \nAnabela Fuentes Garcia, Villa Cristiana community leader \nDr Kevian Perez, researcher at the Coastal Research and Planning Institute of Puerto Rico at the Graduate School of Planning

(Photo: Puerto Rico after Hurricane Maria. Credit: Orlando Sentinel/Getty Images)