Since the 1970s, the molds in our environment have become much more aggressive due to the widespread use of a fungicide called Benomyl,1,2 through a process similar to the creation of superbugs by
overuse of antibiotics.
In the agriculture industry, Benomyl killed nearly all of the fungi on crops such as strawberries and wheat, but the few surviving fungi happened to be highly toxic molds — which are now flourishing in our environment.
In the 1970s, Benomyl was also added to paints to stop the growth of mold on damp walls, especially in public buildings such as offices and schools.
Just as with food crops, a few types of dangerous mold were selectively allowed to grow unchecked, so we're exposed to more of these dangerous fungi now than at any other time in history, as a direct result of these chemical fungicides.
In the US,
45 million people live and work in moldy buildings, and approximately half of all US buildings have water damage, which greatly increases the likelihood of hidden toxic mold.