The Groasis Waterboxx is a low-tech device that helps seeds and saplings grow into strong trees in dry environments. It collects and stores rainwater and condensation to slowly water the roots daily. In tests, 88% of trees grown with the Waterboxx survived compared to only 10.5% without it. The inventor believes using this technology could reforest billions of acres and offset humanity's carbon emissions by capturing CO2 in new tree growth.