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Although the Mars Rover/Sample Return was presented as a U.S. mission in this initiative, it could be performed in cooperation with our allies and/or in coordination with the Soviet Union. In fact, planetary exploration is well suited to international cooperation. The U.S. could benefit significantly by coordinating its Mars Observer with the three sophisticated Soviet missions to be launched for Mars over the next seven years. Coordination of these early flights, and exchange of resulting data, would leave the U.S. better prepared to undertake a Mars Rover/Sample Return mission, whether in coordination with the Soviets or alone.

Planetary exploration need not be NASA's primary focus, but it offers opportunities to exercise leadership in the international arena through organizing and participating in coalitions to achieve objectives which are consistent with U.S. goals, and it can provide important precursor information for either of the larger human exploration initiatives.

Robotic planetary exploration should be actively supported and nurtured within NASA. Although it does not have the immediate relevance of the Mission to Planet Earth, or the excitement of human exploration, it is fundamental science that challenges our technology, extends our presence, and gives us a glimpse of other worlds. As such, it enjoys widespread public interest and support. Although not necessarily at the pace suggested in this initiative, planetary exploration much be solidly supported through the 1990s. 

Mission to Planet Earth 

Mission to Planet Earth is not the sort of major program the public normally associates with an agency famous for Apollo, Viking, and Voyager. But this initiative is a great one, not because it offers tremendous excitement and adventure, but because of its fundamental importance to humanity's future on this planet. This initiative directly addresses the problems that will be facing humanity in the coming decades, and its continuous scientific return will produce results which are of major significance to all the residents of the planet. The benefits are clear to a public that is increasingly concerned about global environmental problems like ozone depletion, buildup of greenhouse gases, and acidification of lakes and forests. And as the environment and its preservation become more pressing issues, the initiative retains its importance for many generations to come. 

For this reason it should enjoy sustained public and congressional support and interest. The U.S. is the only country currently capable of leading a Mission to Planet Earth, but the program is designed around, and requires, international cooperation. Admittedly, the initiative's international scope could complicate its coordination and implementation, but the concept embodies in the initiative enjoys widespread international support. As more and more countries are facing ecological problems, there is increasing interest in a global approach. In fact, this concept is supported by several international organizations, and may emerge as a theme for the International Space Year, 1992. This initiative represents an important opportunity for the United States to exercise leadership in an increasingly significant area. 

As the Earth System Sciences Committee suggests, NASA is a natural leader for a Mission to Planet Earth. The National Science Foundation and the National Oceanic and Atmospheric Administration will play important roles, and interagency coordination is crucial. But since the major focus is on observations from space and the coordination and analysis of these (and ground-based) observations, NASA is uniquely suited to lead the effort. It is a natural use for, and extension of, our low-Earth orbital facilities and capabilities, and would not severely drain resources from existing programs. This is an initiative well with in NASA's 

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