Tantalum is a rare metal that is used in the manufacture of cell phones and camera lenses but you'll be surprised to know that if every human on the planet were to consume this metal at the same rate an average US resident today, the metal supplies won't last for more than 20 years.
Far too many people do not turn off the computer when they are done for the day. But a small change in habit could made a great impact on the environment by reducing carbon emissions. The HP Widgets reminds you to shut down every day.
Sign-up with Reply for All and choose the cause you want to support via your email signature - it could be Cancer cure, AIDS prevention, animal rights, children's rights, global warming, clean water, poverty or education.
iPhorest is an iPhone app that allows users to plant trees from their phone. As the seedling on your phone grows, you can pass on the seeds to other phones and thus help accelerate the forestation effort.
The hardcover verion of the book sells for around $45 on the Amazon store but they now provide a PDF version that anyone can download for free. You don't need an Amazon account to download the photo book in PDF format from amazon.com.