There are many words associated with the Slow Food Movement, and using some of them when you search will help you get better results. Here's some keywords to consider:
ecogastronomy biodiversity 100-mile diet
sustainable agriculture locavore slow food movement
Carlo Petrini local food sous-vide
Terra Madre Ark of Taste Presidia
Community Shared Agriculture Earth Markets
You may also combine two or more terms to narrow your search, or use other words. You can always tailer the search to suit YOUR research needs.
More detailed search tips are included in the section entitled Help! at the bottom of the page.