The Laws of Physics behind this process, guarantee that those “toxic” (Liberal terminology) chemicals you claim are injected into the ground, are already there and have been there for Millions of years. They simply use them because they are already compatible with the formation. They also get every square ounce of those “toxic” chemicals back to the surface because they blend with the Oil and gas that comes to the surface naturally, due to the Pressure gradient of the formation. Due to your gross lack of understanding, this is all the further I can explain this process to you. I would be glad to clear up any further misconceptions you most likely have, but you will have to let me know what those are.
.5% of 10000 gallons of injected hydraulic fracking fluid is 50 gallons of additives. Which of these additives "are already there and have been there for Millions of years?" Which ones would you allow a corporation to pour into your favorite fishing hole with the guarantee that "They also get every square ounce of those “toxic” chemicals back to the surface?"
I'm all for drilling and becoming energy independent with an "all-of-the-above" approach, but the long-term impacts also need to be considered.