With this new evidence, it seems that instead of breaking down, the chemicals travel through the air, eventually getting trapped in falling snow. When the snow melts, the chemicals are introduced to the ecosystem, and wind up in the food chain. It remains to be seen what, if any, effect these chemicals have on the environment. A study done by the United Kingdom's Environment Agency found that D6 "does not meet the screening criteria for toxicity" after analyzing its effects on fish and invertebrates. Other studies into the safety of these compounds are in the works at other agencies around the world.