If the radiation field frequency changes then our DNA changes? So then the radiation field frequency must be keeping our DNA stable....

Could this affect plants' ability to photosynthesize (and trap carbon). They have DNA. It would not just be humans that are susecptable to changes the radiation field frequency.

Your last link raises another question. It says, "... analysis of better datasets using geostatistics and statistical-regression indicates global temperatures respond significantly to variations in Earth’s magnetic-field strength."

If it the field strength, then once it reverses, it will start to become stronger. The negative effects would be at their worst when the field goes through the zero mark.