As an environmental scientist, I am always trying to highlight sustainable ingredients. Lemons, when sourced locally, organically, and in season, are considered a sustainable crop.
Lemons require a relatively low amount of water and emit a very small amount of carbon.
Check when lemons are in season in your area with this Seasonal Food Guide.
It’s important to note that inorganic lemons tend to use a high amount of pesticides. Buy organic lemons when you can to ensure that you are supporting farms that do not contribute to pollution in the form of pesticides.