File:Estuary-mouth.jpg

Estuaries and coastal waters are among the most productive ecosystems on Earth, providing numerous ecological, economic, cultural, and aesthetic benefits and services. They are also among the most threatened ecosystems, largely as a result of rapidly increasing growth and development. About half of the U.S. population now lives in coastal areas and coastal counties are growing three times faster than counties elsewhere in the Nation. Overuse of resources and poor land use practices have resulted in a host of human health and natural resource problems.

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	此作品在美國屬於公有領域，因為其是由美國政府的官員或僱員，基於其個人公務目的製作的作品，參考美國法典第17篇第1章第105條。 注意︰本模板僅適用於美國聯邦政府的原創作品，不適用於任何美國州、屬地、聯邦個體、縣、市或任何次級政府的作品。本模板也不適用於1978年以後由美國郵政署出版的郵票圖案（參看美國版權局實踐綱領第313.6(C)(1)條）。也不適用於部分美國硬幣；參看美國鑄幣局使用條款。
此作品無已知的著作權限制，亦不受所有相關和鄰接的權利限制。

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse