You may want to consider two possible approaches for having students/visitors design solutions to local impacts: an engineering design project or a student action plan. Here are two starting points for you to investigate.

• Creative Engineering, from TeachEngineering
• School Projects, from BayBackpack

Another really interesting resource to take a look at as you and your students/program participants are considering responses to climate change is PROJECT DRAWDOWN.  This organization looks at and ranks by it's effectiveness all kinds of responses to climate change.

For other specific ideas about student climate action projects take a look at these sites:

• Alliance for Climate Education
• Climate Generation

Do you have or can you find additional resources on the web (or elsewhere) for action project ideas?