Today I've begun to add links.
The first two - eating well and eating green - are ones I recommend for anyone beginning to think more deeply about food. Be inspired by the quotations, and take stock of what you are eating and its impact on the environment.
The National Council of Churches Eco-Justice site on Food and Farming and the site of Environmental Commons are great places to look for resources and ideas. I particularly recommend the handouts available on the Environmental Commons site.