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Much of the Netherlands is below sea level. This is a concern if sea levels rise due to global warming.

"The Netherlands is a low-lying nation, with a sophisticated agricultural sector and high population density. Half of the country lies less than 1 meter above sea level, with an eighth of the country lying below sea level. Without an extensive network of dams, dykes and dunes, the Netherlands would be especially prone to flooding. As a predicted outcome of Global Climate Change, sea level rise could impact the Netherlands drastically, leading to social and economic devastation.

The threat of sea level rise due to Climate Change will test the country’s flood protection system. A breach of this system would be costly to repair, but would be even more devastating to the country’s economy and way-of-life.

As its name suggests, the Netherlands, or ‘low countries,’ is and has been especially prone to flooding. Climate change has the potential to increase sea levels by 20 feet (6.1 m). The lowest city within the Netherlands lies 7 meters (23 ft.) below sea level, much lower than New Orlean's 9th Ward. The expansive system of dams, dykes, and dunes maintained by the country, may not be able to hold back the flood of Climate Change.

Climate change can potential lead to devastating economic issues for the Netherlands."

Source: http://www1.american.edu/ted/ice/dutch-sea.htm