Historically, clean-air rules are almost always litigated, so having sound science on her side is essential.
But in the country, propane is prized as historically cheap, clean and versatile.
For example, natural spring water from artesian wells was historically considered clean for all practical purposes, but it came under scrutiny during the first decade of the 21st century because of worries over pesticides, fertilizers, and other chemicals from the surface entering wells.
Historically, smaller blazes would clean up this dry vegetation, reducing the fuel load that wildfires use to spread.
Outside neat rows of white tents, they cleaned flintlock muskets, cooked over campfires in steaming kettles, and ate historically accurate lunches from tin plates.
Though the Clean Air Act grants California special authority to restrict auto emissions to clean up its historically smoggy cities, for the past decade policymakers there and back east in Washington had agreed to keep a uniform set of standards so carmakers did not need to meet different rules in different U.S. states.
Cities and states across the country are experimenting with how to clean up the historically clogged criminal justice system, which sees 1 in 111 Americans, or 2.2 million in total, behind bars on any given day, and leaves 1 in 3 adults with some sort of criminal record.
Congress has allowed to lapse the special corporate taxes that once underwrote the "orphan fund" used to clean sites whose pedigrees were historically and legally obscure.
The effect of all these people — selfie sticks moving through the air like antennae — gives the place the unfortunate air of a Disney set: a hyper-clean, historically accurate medieval town as realized on a Universal Studios back lot.
For example, natural spring water from artesian wells had historically been considered clean for all practical purposes; however, it came under scrutiny during the first decade of the 21st century because of worries over pesticides, fertilizers, and other chemicals from the surface entering wells.
