In 2008, The Nature Conservancy worked with communities in the Hudson River Estuary watershed, USA, with the aim of preparing for the impacts of climate change. In a series of workshops over the course of 18 months, more than 160 stakeholders were consulted, including railroad executives, utility companies, the insurance industry, emergency and health groups, planners and conservation leaders. They identified and discussed important drivers (e.g. land-use trends, the political climate) and key uncertainties around those drivers (e.g. will there be strong ‘top-down’ political support for climate change adaptation?). By manipulating these uncertainties and trends, they created four plausible scenarios, which were described using suggestive titles and narrative details. The feasibility of different policies or response options (e.g. changing the requirements for new storm water permits) could then be evaluated, in terms of both the likelihood that they would be adopted in each scenario and how they would perform in each scenario. The ‘top performing’ options were those that scored relatively highly across the four scenarios.

United States of America
Lesson learned: 
This project provides an example of the potential of scenario planning for evaluating intervention options. Focusing on the Hudson River Estuary watershed provided clear geographical scope and the drivers explored were well-defined and easily monitored (e.g. the price of gas), meaning that trends within different scenarios could be explicitly and realistically quantified.
Scope: Sub/regions covered: 
North America
The response options evaluated were specific enough to be implemented on the ground, for example the development of emergency action plans with community involvement
Related Terrestrial and aquatic units of analysis: 
Inland Surface Waters and Water Bodies/Freshwater - rivers, lakes and estuaries
Tools and instruments: 
Contact details
Contact Name (Person or group/organization): 
IPBES Secretariat