The dependence is both indirect, and direct. Beside the obvious ethical issue of just distribution of resources, which affects human relationships in the biosphere, there are further relationships between people and water. Water has spiritual images of cleansing, purity, being used in most religions. People may also have sociobiological fondness for water, as with other parts of the environment. It is an advantage biologically to like water, and an advantage to value nature.
Water appears to be refreshing for soul as well as body.
One of the common themes seen in the comments and pictures of nature and life was water, especially rivers and ocean sunsets, with ponds containing birds, fish and other animals. This data confirms that water is a common image of nature. Water has deep meanings for people, and by exploring this relationship we may not only understand more the relationship between living organisms, people and the environment, for aquaculture, fishing, and enjoyment, but also we may understand more of ourselves. In the global age we live in, the question of the common oceans and the required diplomacy, provides very important precedents and lessons for future global planning. It also provides a precedent for protecting biodiversity that is increasingly being recognised on the land too.