I've worked with these folks at UW and tested their "Halobacteria" Labs in my classroom. If you're in a low-income school, they'll send you everything for free. Halobacteria are a great, resiliant model organism to grow in your classroom. Also Sea Monkeys (Brine Shrimp) love them and you can do a whole salty ecological community. They have lots of modules on Systems Thinking and dyanamic biological and environmental systems. Love their "cell phone" unit.
Use gapminder.org to play with data and see some REALLY great graphs. Warning it can be addictive! This information was shared with Climate Change Lessons from Judi Kusnick at CSU, Sacramento. If you google Judi's name, all of her workshops are available online with resources for the lessons she has shared.