We publicly launched the N-Calculator in the United States on February 19th, 2011, at the annual AAAS meeting in Washington, DC. We announced the launch of the tool at a symposium on nitrogen titled "Global and Local Responses to the Nitrogen Challenge: Science, Practice, and Policy."
We publicly launched the N-Calculator in Europe at the "Nitrogen and Global Change" conference in Edinburgh, UK on 13 April 2011.
You can view some of our press coverage to date at the following links, starting with the most recent coverage:
The European Commission included an article titled "Online calculator measures consumers' 'nitrogen footprint'" in the March 2012 issue of "Science for Environment Policy: DG Environment News Alert Service"