Essays / Environmental / Genetic Modification Concerns - help on thesis statement [4]

Help with a thesis on environmental implications of genetically modified organisms

The topic is environmental implications of genetically modified organisms. After doing research I found that there are many positive as well as negative impacts on the environment. I would like to make my essay about the pros and cons of genetically modified organisms without making it sound too indecisive. I need help thinking of a solid thesis that will set the tone for the rest of the essay.