Natural hazards study requires the implementation of a holistic approach that mobilises a wide range of expertise such as urban planning, hydrometeorology or hydrology and hydraulics. Typically, this task involves cross-referencing hazard (intensity and probability of occurrence) with the vulnerability of exposed areas (populations, habitat, economic activities, etc.).
In the same way, resilience to climate change is essentially based on:

• Mitigation i.e. reducing, through natural processes or technological means, the amount of greenhouse gases in the atmosphere.
• Adaptation, i.e. reducing both risks and impacts of the adverse effects of climate change (storms, floods, drought, etc.).

Mitigation is a medium and long-term commitment, while adaptation is an immediate necessity.
In the case of flood risk management, resilience is based on :

• Mitigation aimed at reducing flood risk by reducing either the hazard (through structural measures) or the level of vulnerability of exposed areas (through the implementation of structural or non-structural measures). 
• Adaptation: regardless of the degree of protection, an event of lower probability will always occur. Adaptation therefore aims to deploy measures that ensure effective early warning and crisis management, as well as the most efficient possible return to normal conditions.

Our approach to climate change and natural risks is based on:

• Mobilisation of strong technical expertise (expert knowledge of the underlying phenomena) which allow us to translate and quantify climate change into physical impacts (increase in extreme rainfall and flooding, increase in drought episodes, intensification of cyclones, marine submersion, etc.).
• Study of the impacts on exposed populations and activities (expertise in urban planning and urban sociology).