People on the beach next to a poster about rising sea levels in Eastbourne, East Sussex, UK.

People pack the beach at Eastbourne next to a sign explaining how the sea level along the coast between Pevensey Bay and Eastbourne, East Sussex, UK, will rise over the next 100 years. Climate change is having a significant effect on the world and rising sea levels are threatening millions of people around the world. (Photo by: Andy Soloman/UCG/Universal Images Group via Getty Images)