Caffeine has a stimulating effect on the central nervous system - as most coffee drinkers will attest, it provides a boost to our productivity and creativity. It has also been associated with lower risk to Alzheimers and other forms of dementia (NIH).
Unfortunately, especially, as a US citizen (to where these products must be shipped overseas), coffee and tea have high water footprints environment - I'm less concerned about their Carbon footprint, which is on the order of 10 kg CO2eq per year per person that drinks a cup a day (the Guardian). Waterfootprint.org estimates a standard cup of coffee to require 140 L in the Netherlands, compared to 35 L for tea. On a per unit mass basis, it even beats meat in terms of its water consumption - 18,900 L/kg compared to 15,400 L/kg for beef (Virtual Water).
Yerba Mate markets itself to environmentally and socially conscious caffeine drinkers. How does it compare to coffee and tea in terms of carbon and water footprint? Less relevantly, but if information equally accessible, how does it compare in terms of health and caffeine?