Epa uses national energy data, data on national agricultural activities, and other national statistics to provide a comprehensive accounting of total greenhouse gas emissions for all man-made sources in the united states. In the united states, hfc-134a is used in all new domestic automobile air conditioners for example, hfc-134a is growing rapidly in 1995 at a growth rate of about 100% per year with an atmospheric lifetime of about 12 years 12. Carbon dioxide was the first greenhouse gas demonstrated to be increasing in atmospheric concentration with the first conclusive measurements being made in the last half of the 20th century prior to the industrial revolution, concentrations were fairly stable at 280ppm. But the same compound, a form of oxygen, is a good guy in the upper atmosphere, where it blocks out harmful ultraviolet light scientists first theorized 15 years ago that man-made chemicals could break down the protective ozone layer their warnings led to a ban of cfc aerosols in this country in 1978.
Oxygen and carbon and man-made releases of krypton-85, tri- tium, and pesticides can be used to estimate the relative ages of ground water (plummer and others, 1993. Even if every man-made cfc were somehow transported to the ozone layer now, one thing that kim did mention is that 20 years is not a long time to do research on meteorologic[al] phenomena this is indeed the truth. The top 50 inventions of the past 50 years lukewarm reception in the united states japanese manufacturers love it and, after licensing the design in 1968, go on to dominate the global market.
Ozone depletion by wm robert johnston last updated 9 june 2002 ozone ozone (o 3) is a gas with molecules made of three atoms of oxygenthis is different from the oxygen we breath (o 2), which has two atoms of oxygen and makes up 21% of the earth's atmosphere. Chlorofluorocarbon: chlorofluorocarbon (cfc), any of several organic compounds composed of carbon, fluorine, and chlorine when cfcs also contain hydrogen in place of one or more chlorines, they are called hydrochlorofluorocarbons, or hcfcs. History of the aerosol the first use for an aerosol package arose during world war ii, but the idea of using low-pressure liquefied gas to atomize droplets of liquid in the air was developed in 1924.
The first automobile to be mass produced in the united states was the 1901, curved dash oldsmobile, built by the american car manufacturer ransome eli olds (1864-1950) olds invented the basic concept of the assembly line and started the detroit area automobile industry. The ozone layer is made of three oxygen atoms combined together when chlorine breaks away from the cfc and becomes free, it eventually steals oxygen away from the ozone. Manufactured natural gas of this type (as opposed to naturally occurring gas) was first brought to the united states in 1816, when it was used to light the streets of baltimore, maryland. Fluorinated gases are man-made gases that can stay in the atmosphere for centuries and contribute to a global greenhouse effect there are four types: hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride and nitrogen trifluoride.
The invention and uses of the cfc man-made gases in the united states. Smoke rises from chimneys at a steel and iron plant in china different gases and particles released by human activity create different amounts of warming and cooling.
Refrigerators from the late 1800s until 1929 used the toxic gasses, ammonia (nh3), methyl chloride (ch3cl), and sulfur dioxide (so2), as refrigerants several fatal accidents occurred in the 1920s because of methyl chloride leakage from refrigerators. In the 1970s, producers and users of cfcs in the united states waged a long, hard battle against the regulation of cfcs111 while industry was unable to prevent the regulation of cfc use in aerosols, they did prevent epa from proposing regulations regarding non-aerosol uses of cfcs.
A special numbering system is used for fluorinated alkanes, prefixed with freon-, r-, cfc- and hcfc-, where the rightmost value indicates the number of fluorine atoms, the next value to the left is the number of hydrogen atoms plus 1, and the next value to the left is the number of carbon atoms less one (zeroes are not stated), and the remaining atoms are chlorine. 10 well intentioned inventions with catastrophic results^10 well intentioned inventions with catastrophic results^this list takes a look at some important and well intentioned inventions that eventually ended up causing catastrophe through environmental damage or loss of life. List of greenhouse gases while natural water vapor has the greatest impact on the greenhouse effect, carbon dioxide, methane, and nitrous oxide are the most notable man-made contributors co2 from fossil fuel consumption is the best known source of greenhouse gas, though certainly not the only one.