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English
Description
The oceans, where life first began, occupy more than 70 percent of the Earth's surface. About half of the planet's 7 billion people live in close proximity to an ocean. We depend on them for food, energy, and recreation. Yet we know comparatively little about the oceans. One thing we do know, though, is that human activities are causing them harm. Although the oceans are immense, they are also in need of protection. The countries of North America...
Author
Language
English
Description
Water is one the most vital resources on the planet. Humans can live for weeks without food but only a few days without water. We cook with it, swim in it, and fish in it. Yet we humans often abuse water. We taint it with chemicals and human sewage. Water is more precious to us than gold, and yet we often waste it. As our population grows, there may not be enough freshwater to go around. The countries of North America have always had plentiful natural...
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