This inflatable is far beyond a DIY project for you and me, but it's impressive and makes a bold statement. WWF used it in China to demonstrate the emissions and pollution coming from one car in a single day.
Amy - This poster design is a great example of visual metaphor that reminds me of global-warming. A graphical drawing, of polar bears standing anxiously on top of unsafe separated ice pieces, is hanging on top of a warm light lamp. It makes me think that forgetting to turn off a lamp can cause such a big disaster. I find this advertisement very effective in warning people to save power and electricity.