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there are potent concerns that will be facing humanity in the coming decades. The scientific return from a Mission to Planet Earth could significantly enhance the quality of life on this planet. Our space program is a national asset. It embodies this nation's vision to explore new frontiers. In developing the capabilities to explore the mysteries of other worlds, we have also acquired the ability to explore our own world in a way that was impossible only a few decades ago. It is important to recognize the key role of space in understanding earth, and to exploit our space program to explore not only other worlds, but our own as well. 5