I choose organic over conventional every time. Organic was good enough for tens of thousands of years. More, we just don't know the effects of what all these chemicals will have on us as they hit us generation after generation… and we won't know for sure no matter how much we think we will until that those generations come.
Organic food provides significant environmental benefits to plant-rich diets. A study of the diets of 34,000 people confirms that a diet high in fruit and vegetables is better for the planet than one high in animal products. The study also finds that organic food provides significant, additional climate benefits for plant-based diets, but not for diets with only moderate contribution from plant products. This is the first-ever study to look at the environmental impacts of both food choices and farm production systems. Source 6r.