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The balance of nature in the world's seas is the topic of the Challenge of the Seas series, as it focuses on problems rising from the over-harvesting of fish and the continual dumping of wastes into oceans. Some species of plants and animals are more vulnerable than others, and when one group disappears, the impact can be far-reaching. In Challenge of the Seas, Vol. 2: Refuge in the Sea, host Ted Danson offers information regarding kelp forests, which support many species, large and small. The health of one important link in the underwater food chain can mean the difference between life and death for a number of creatures.