Chlorofluorocarbon (CFC).
The only pollutant that has increased in emissions since 1970 is carbon dioxide (CO2). This rise is primarily attributed to the burning of fossil fuels for energy, transportation, and industrial processes. Unlike other pollutants that have seen reductions due to regulatory efforts and cleaner technologies, CO2 emissions have continued to grow, driven by increasing energy demand and population growth.
"lead" is the air pollutant that decreased most in 1970 to 1991.
It increased significantly.
it is increased, but there is no where where the topic might not be able to be found
Australia's population has increased
Between 1970 and 2007, the captive population of golden lion tamarins increased significantly, from about 200 individuals in 1970 to approximately 3,000 by 2007. This represents an increase of around 1,400%, reflecting successful conservation efforts and breeding programs aimed at preserving the species.
The six pollutants regulated under the Clean Air Act are sulfur dioxide, nitrogen dioxide, carbon monoxide, lead, particulate matter, and ozone. Despite a 42% increase in energy consumption from 1970 to 2001, the regulations and technologies put in place to control these pollutants have helped to reduce their emissions and improve air quality in the United States.
increased substantially
Between 1930 and 1970. Roughly speaking, population doubled during such years, but GDP increased over six times from the 1930's levels.
2009 - 1970 = 39.
The nation's divorce rate increased significantly.
There is no catalytic convertor on a 1970 Chevy truck. Emissions regulations, and the use of emissions reducing equipment, were not employed until 1973 when the body style of Chevy trucks changed to the square body style that was used from 1973 to 1987. Catalytic convertors themselves were not factory installed until the second half of 1975. To date, any vehicle made before 1975 is exempt from emissions testing since the required equipment was not installed at the time of manufacture.