The world’s six largest agrochemical and seed corporations are filing sweeping, multi-genome patents in pursuit of exclusive monopoly over plant gene sequences. Marketed as crops genetically-engineered to withstand environmental stresses such as drought, heat, cold, floods, saline soils, and more, this development could lead to control of most of the world’s plant biomass – whether it is used for food, feed, fibre, fuel or plastics. Under the guise of developing “climate-ready” crops as a silver bullet solution to climate change, these companies are pressuring governments to allow the broadest and potentially most dangerous patent claims in intellectual property history. But can patented techno-fix seeds provide the adaptation strategies that small farmers need to cope with climate change? On the contrary, these proprietary technologies are poised to concentrate corporate power, drive up costs, inhibit independent research, and further undermine the rights of farmers to save and exchange seeds. For the “Gene Giants,” the goal is “biomasstery” – to profit from the world’s biomass.