OUR RECENT STUDIES DEMONSTRATED THAT CARBON-BASED NANOMATERIALS CAN BE USED TO ACCELERATE SEED GERMINATION AND PLANT GROWTH. THIS CAN OPEN NEW PERSPECTIVES FOR A NUMBER OF AVENUES RANGING FROM NUMEROUS AGRICULTURAL CROPS TO BIOENERGY AND SPACE-GROWN PLANTS. HOWEVER, A POTENTIAL ENVIRONMENTAL RISK OF USING CARBON NANOPARTICLES AS GROWTH REGULATORS NEED TO BE ASSESSED. THE MAJOR GOAL OF THIS PROJECT IS THE EVALUATION OF A POTENTIAL ENVIRONMENTAL RISK OF THE ACCUMULATION OF CARBON NANOMATERIALS DELIVERED TO THE ENVIRONMENT WHEN USED AS REGULATORS OF PLANT GROWTH OR AS WASTE. WE SUGGEST THAT COMMONLY USED TYPES OF CARBON-BASED NANOMATERIALS WILL BE ACCUMULATED IN PLANT ORGANS AT VERY LOW CONCENTRATIONS, AND, THUS, THE CONTAMINATED TOMATO ORGANS WILL HAVE LOW OR NO TOXICITY TO ANIMALS AT THESE DOSES. WE EXPECT THAT OUR APPROACH FOR ESTIMATION OF ENVIRONMENTAL RISK OF CARBON NANOPARTICLES WILL SERVE AS A PLATFORM FOR FUTURE INVESTIGATIONS FOCUSED ON THE CLARIFICATION OF POSSIBLE ENVIRONMENTAL RISKS OF ALREADY DISCOVERED AND NEW NANOMATERIALS.