when you add to those sources the deliberate rain of toxins via chemtrails, the toxic waste in landfills, and unsafely stored radioactive materials, it is overwhelmingly clear that nothing in your world has escaped humankind's negligence, at the very least, and criminal contamination at worst.

Write the above sentence using proper case.
When you add to those sources the deliberate rain of toxins via chemtrails, the toxic waste in landfills, and unsafely stored radioactive materials, it is overwhelmingly clear that nothing in your world has escaped humankind's negligence, at the very least, and criminal contamination at worst.