Climate change is likely to have significant impacts on medicinal herbs from quality to where they grow. Field studies in the UK determined that increasing winter temperatures in concert with summer droughts will reduce St. John's wort abundance in England. Temperature stress can also affect secondary metabolites and other compounds that are responsible for the majority of their medicinal activity. In the case of St. John's wort, known for antidepressant effects, when grown under artificially high temperatures the plants produced higher levels of secondary metabolites. The researchers viewed this as a potential positive development. 
Yields of major staple crops like wheat and rice are being hurt by increasing temperatures. Wine grape production is moving to cooler climes causing changes in the character of some of our favorites. The flavors and health benefits of teas, the size of potatoes, the sting of a hot pepper, where fish call home in the oceans, and a future decline in protein in vegetables—it’s all changing.
Our food database shows the ingredients affected by a changing climate.
To learn what farmers, scientists, and many others are doing to keep the menu stocked, see Stewardship of the Land and Our Changing Menu: Climate Change and the Foods We Love and Need. You have a role, too!
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This food ingredient database is in its early phase and we will strive to expand it on an ongoing basis so that everyone is aware of how climate change is affecting the foods we love and need.