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It has been measured empirically since 1957 and has been rising through the entire record. Proxy records show that it has been rising for at least 150 years.
Vostok records show a gain for the past 10,000 years.
The interesting issue here becomes one of who you should believe on the subject.
No one is doubting that CO2 levels have been rising for the past 30 years. Longer term though starts getting far more gray.
The "norm" from thousands of observations made in the 1800's showed CO2 levels at 400 PPM to even as high as 440 PPM in the late 1880's.
Vostok records show climbing levels of CO2 always following temperature by about 800 years. Thus we see steady climbing for 10,000 years.
Alarmists use Vostok records for historical data. They compare these values with global averages for recent times. Under this method we see CO2 growth of 30% Antarctica compared to worldwide. (Antarctica to Antarctica shows far less growth, almost zero)
Skeptics point out that the average measured in the 1800's was about 400 ppm, with times showing over 440 ppm. These measurements were performed by noble prize winning scientists.
We KNOW that current worldwide averages are about 387 ppm. (Less at the poles)
The net result is that are current knowledge of CO2 rise is somewhere between a slight decrease from 1880 to a 30% increase, depending on how, who and where we get the data.
What else can I help you with?
How many CFC's are used each year?
CFC amount has been growing over the years. They do destroy ozone very much.
How many years has it been science 1918?
It has been 103 years since 1918.
How many years has Pluto been considered a dwarf planet?
As of 2013, Pluto has been classed as a dwarf planet for 7 years.
How many years have the planets been in space?
About 4.5 billion.
How many years are the rock cliff mansion have been alive?
Rock Cliff mansion has been around for about 110 years. It was built in 1911.
What historical events in Dublin?
Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.Dublin is over 1000 years old, so there have been many historical events, too many to list. A couple of the more famous ones include the Battle of Clontarf in 1014 and the Easter Rising in 1916.
How many years did Ireland fight with Britain in the Easter rising 1916?
2 weeks
How many CFC's are used each year?
CFC amount has been growing over the years. They do destroy ozone very much.
Why has Bray Station in Southern Ireland been renamed Bray Daly?
It has been called Bray Daly Station for many years. It was named in honour of Edward Daly who fought & died in the 1916 rising. The signs have just been replaced recently to reflect that.
How many years can Asian people be in college?
any amount of years
How many years are you alive for?
Everyone is alive for different amount of years
How many years have there been since 1776?
How many years have there been since 1776?
How many years has it been since 1997?
how many years has it been since 1997
Olivers grandfather invested 150 at 5 percent interest compounded quarterly When Oliver inherited it the amount was 6000 For how many years had the 150 been invested?
74 or 75 years
How many years have the Game Boy been out?
they have been out 61 years
How many years has it been since 1979?
It has been 33 years
How many years has it been since 1994?
It has been 15 years
