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"Schools Global Footprint is a teaching resource that helps you to explore and to reduce the environmental effect your school has on the planet. The global footprint calculator is a great tool for helping you reduce your schools' ecological footprint by taking action on six topic areas including: energy, transport, food, waste, water and buildings."

"Animaps extends the My Maps feature of Google Maps by letting you create maps with markers that move, images and text that pop up on cue, and lines and shapes that change over time. When you send your Animap to friends it appears like a video - they can play, pause, slow and speed up the action!"

interesting to read the readers comments below as well

Interesting to view the contribution of readers as well.

More than 100 science academies around the world have called on world leaders to take action on population and consumption at the Rio+20 summit. They say past failures on these issues threaten the natural world and prospects for future generations. The science academies include the UK's Royal Society as well as its peers in countries at all stages of development.

1. Price Elasticity of Demand This measures the relationship between changes in price of a product and the change in demand for the product.

Clear, but just text - could be used as a reference for some independent learning (homework) - does include an 'Action' and has some side links for further study.