Orange You Glad Advertising’s Going Eco-Friendly?

For Tropicana juice’s latest ad campaign, they went back to basics and filled billboards with hundreds of oranges, the acid of which generated enough electricity to light up the billboard.

Advertising agency DDB may’ve wasted dozens of perfectly good oranges, but in using the copper and zinc spikes to harness the acidic electrochemicals inside the oranges, they got their message across tastefully, environmentally friendly and creatively. [DDB via Coolest Gadgets via Inhabitat]