After activists and governments collaborated in the 1970s to outlaw leaded gasoline worldwide and to reduce other sources of lead exposure, average lead levels in our blood dropped by more than 80%. This is a huge public health benefit because lead exposure can increase the risk of heart disease, kidney disease, and probably also dementia. It is also an example of why author Pagan Kennedy says that when it comes to factors impacting longevity, "the decisions that we make as a collective matter more than any lifestyle choice we make on our own.
a) True
b) False