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Thought for the day...
- Thread starter Wendy
- Start date
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I never granted you permission to post my portrait.
Get the lead out.
https://www.pnas.org/doi/10.1073/pnas.2525498123
Lead (Pb) is well known to be toxic to humans. We use archived hair from individuals living along the Wasatch Front in Utah to evaluate changes in exposure to lead over the last 100 y. Current concentrations of lead in hair from this population average almost 100 times lower than before the establishment of the Environmental Protection Agency. This low level of lead exposure is likely due to the environmental regulations established by Environmental Protection Agency.
Congress created the US Environmental Protection Agency (EPA) in 1970 to address national air and water pollution problems, including lead exposure. Lead (Pb) exposure occurs in the environment through several sources including leaded gasoline, smelters, leaded paint in older buildings, and domestic water supply lines as solder and as leaded pipes (1). Pb exposure is detrimental to human health and there is no safe level of Pb exposure (2). Because of the concern over environmental Pb exposures (3), efforts worldwide have been made in the past 50 y to reduce human exposure to Pb.
...
Concentrations of Pb in human hair from the Salt Lake City region population had very high levels from 1916 to 1969 before the establishment of the EPA, with individual values ranging between 28 and 100 ppm (Table 1 and Fig. 1). In the decades of the 1970s through the 1990s, the average values declined from about 50 ppm in the 1970s to 10 ppm in the 1990s. The decline has continued to the present day with average values post-2020 of <1 ppm (Fig. 1 and Table 1). Therefore, the lead concentrations in hair have declined by about 2 orders of magnitude since the establishment of EPA and implementation of measures to reduce human exposure to Pb.
https://www.pnas.org/doi/10.1073/pnas.2525498123
Lead (Pb) is well known to be toxic to humans. We use archived hair from individuals living along the Wasatch Front in Utah to evaluate changes in exposure to lead over the last 100 y. Current concentrations of lead in hair from this population average almost 100 times lower than before the establishment of the Environmental Protection Agency. This low level of lead exposure is likely due to the environmental regulations established by Environmental Protection Agency.
Congress created the US Environmental Protection Agency (EPA) in 1970 to address national air and water pollution problems, including lead exposure. Lead (Pb) exposure occurs in the environment through several sources including leaded gasoline, smelters, leaded paint in older buildings, and domestic water supply lines as solder and as leaded pipes (1). Pb exposure is detrimental to human health and there is no safe level of Pb exposure (2). Because of the concern over environmental Pb exposures (3), efforts worldwide have been made in the past 50 y to reduce human exposure to Pb.
...
Concentrations of Pb in human hair from the Salt Lake City region population had very high levels from 1916 to 1969 before the establishment of the EPA, with individual values ranging between 28 and 100 ppm (Table 1 and Fig. 1). In the decades of the 1970s through the 1990s, the average values declined from about 50 ppm in the 1970s to 10 ppm in the 1990s. The decline has continued to the present day with average values post-2020 of <1 ppm (Fig. 1 and Table 1). Therefore, the lead concentrations in hair have declined by about 2 orders of magnitude since the establishment of EPA and implementation of measures to reduce human exposure to Pb.
Simultaneously, IQs seem to have dropped.
Lead shifted the curve.
Imagine how much more they might have dropped otherwise.
I think hormesis is a thing (possibly but not necessarily with respect to lead).
For example, IMHO, modern day youth mental health issues are exasperated by the of lack available natural nicotine (i.e. sneaking cigarettes behind the woodshed).
I was a smoker in my youth (I still enjoy cigars). One positive thing about tobacco: no matter how hopeless the future looks, you can always look forward to the next cigarette!
So, yes, I think attempting to eliminate all the "bad" things from our world sometimes has negative unintended consequences.
I agree with the last sentence, but certainly not to the point of concluding that eliminating ANY bad thing has negative consequences.
I wasn't aware I concluded that. Thanks for the update.
It's strongly implied when you conclude that getting rid of lead pollution in the environment has negative consequences.
I'm referring to your previous post where you deemed it somehow relevant to observe that, in conjunction with lead pollution decreasing by two orders of magnitude over a fifty-year period that, "Simultaneously, IQs seem to have dropped."
Now, either you were trying to make some relevant point, or you were just spouting a random and pointless correlation in order to waste bandwidth. Might as well point out that, over that same period, the number of transistors on a silicon die has increased by three orders of magnitude, or that the number of steam locomotives has also dropped by two orders of magnitude. Or any of tens of thousands of other meaningless correlations.
