Unidata celebrated its 25th anniversary on 15-16 October with a rare gathering of staff, founders, partners, and collaborators from around the country. Attendees celebrated the program's accomplishments and looked ahead to the future.

A growing body of research now confirms that the Montreal agreement averted at least one catastrophic form of climate change, even if others still loom. "The Montreal Protocol is a major success story," says William Randel.