As a Mediterranean coastal city, Barcelona is particularly vulnerable to climate change. Its high population density also magnifies the local heat island effect which causes an array of health and environmental challenges. Climate change projections include a rise in average temperature and a significant decrease in rainfall, with expected lasting droughts and intense heat waves. In response, Barcelona has committed to becoming a global model of a sustainable city combating urban development challenges related to climate change and population density.

The 19^th century industrialisation in Lodz heavily affected the city’s rivers, altering their ecosystems and hydrology. Many rivers in the densely built-up city were canalized. This resulted in a higher flood risk from runoff during heavy rain periods. Low water retention also implies reduction of soil moisture during dry spells, contributing to higher temperature and reduced air humidity (urban heat island). Based on climate change projections, it is expected that the intensity of heavy rain periods and higher temperatures will increase and exacerbate these problems.

The Zaragoza Water Saving City programme was initiated in 1996 in response to water scarcity and is still on-going. It has included awareness raising campaigns, the implementation of examples of good practice of reduced water consumption and voluntary public commitments by citizens and businesses. The water tariffs were revised to provide disincentives and incentives that ensure a full cost recovery whilst maintaining affordability for low-income households. The programme also involved improvements to the water distribution infrastructure to reduce the waste of water.

Tamera, a farm of 154 ha, is located in the most arid region of Portugal (Alentejo). This area has shown significant trends of increasing erosion and desertification. Only a few decades ago, the Alentejo was a region where the streams flowed with water all year round, even in summer. Today the streams swell only during the rainy season and afterward they become dry again. The system has fallen completely out of balance and climate change is expected to exacerbate the situation.

To combat the impacts of cloudbursts, the City of Copenhagen developed a Cloudburst Management Plan in 2012, which is an offshoot of the Copenhagen Climate Adaptation Plan. The Plan outlines the priorities and measures recommended for climate adaptation including extreme rainfall. The City carried out an overall assessment of the costs of different measures (traditional vs different options including adaptation measures), the cost of the damages despite the measures and resulting financial impact.

A series of actions were taken to address erosion in the coastal area of Marche region in Italy. The interventions carried out in the section of coast between the municipalities of Sirolo and Numana represent an example of what has been implemented throughout the whole coast of the region. Interventions included: beach nourishment, cliff stabilisation and removal of a portion of artificial reef.

The Kruibeke Bazel Rupelmonde (KBR) Controlled Flood Area (CFA) is a key component of the Belgian Sigma Plan for the Scheldt Estuary. The Sigma Plan is an integrated flood protection plan that combines dikes, seawalls and flood areas to protect approximately 20,000 hectares of land from flooding.

As a result of sloped topography and impermeable ground surface, the Gomeznarro Park in Madrid was affected by erosion during heavy rainfall events, and the surrounding residential areas suffered from flash flooding. In response to these problems, in 2003 complex works aiming at improving the natural drainage and rainwater retention were carried out in the park.

Climate change impact assessment has been an integrated part of the design and planning of the Copenhagen metro since the first metro line was designed in the mid-1990s. For this scope, Metroselskabet, the Copenhagen metro company, developed a climate change adaptation strategy, which supports the integration of adaptation aspects since the planning and dimensioning phase of the metro system. Apart from the first metro line, opened in 2002, and related extensions in following years, in 2019 Metroselskabet put into operation a new city circle line (Cityringen line M3/M4).

At Nijmegen, the Waal River bends sharply and narrows. This creates a bottleneck, which often caused flooding of the historic city centre of Nijmegen, located on the south bank of the Wall. After the floods of 1993 and 1995 and faced with increased risk of flooding due to climate change, the city of Nijmegen decided to give more room to the Waal River, at the same time protecting nearby natural habitats and providing recreational space.