Tilman, D., & Clark, M. (2014). Global diets link environmental sustainability and human health. Nature, 515(7528), 518-522.
This is perhaps “the” seminal paper on how what we eat impacts the environment and sustainability. It shows the powerful synergy between dietary change and the associated health and environmental benefits it can bring. Both parts of the equation were in the research literature before, but this paper brings it all together in a neat, comprehensive package in a highly respected journal, from highly respected researchers.