This would be a great integration into this unit! What can students do in regards to conservation, being water wise and leaving a smaller footprint on our planet! There are several great resources out there. A few of my favorites are the following:
1) Conservation techniques: drought resistant plants, recycling, compost at your home, drip irrigation, using local products, etc.
2) Water wise: low pressure facets and shower heads, drip irrigation, aware of water consumption
4) What is your footprint?