The Earth, and particularly its climate, is changing. Earth science, therefore, is also changing. And, with those changes, come revisions on not just the missions needed to carry out the science, but how they should be selected.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...