Countless PR pros and corporations used this year's Earth Day as a launch pad for green campaigns, but not all will succeed. As consumers are bombarded with more green messages, they are becoming wearier - and more critical - of what those eco-wrapped packages contain and who's behind them.

There's no doubt that marketing of eco-conscious products and companies will continue to increase market share as consumers become accustomed to picking up energy-efficient light bulbs at Wal-Mart, recycled totes at ...