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Reusing air conditioning condensation to water plants and clean. Repurposing advertising banners into fashionable tote bags. Recycling used cooking oil to power generators at a hospital. Today, McDonald's Corp. (NYSE: MCD) celebrates these and dozens more examples of passion and innovation in the 2012 Global Best of Green report.

whales and other marine animals may play a major role in the worldwide transport of nutrients — from the cold, rich waters of the deep to the warm, nutrient-poor surface. Without these key ingredients, much marine life would cease to exist.

A study published in July in the journal Biogeosciences Discussions estimated that a mere 80 sperm whales that live near Hawaii transport 1,100 tons (1 million kilograms) of nitrogen per year with the movement of their massive bodies through a boundary called the pycnocline, below which it is too dark for light-loving plants — the base of much of the ocean food chain — to survive.