Can you show me a reputable scientist who claims that the 1/3 increase is due to carbon emmissions? No, so therefore your claim is moot.
You have to be joking on this one. Have you ever heard of NOAA? Here's a quote from their website...
"Global combustion of fossil fuels and other materials places almost 7 billion tons of carbon, in the form of CO2, into the atmosphere each year. On average, Earth's oceans, trees, plants and soils absorb about one-half of this carbon. The balance remains in the air and is responsible for the annual increase.
Most of the variability in the year-to-year CO2 uptake is related to natural processes, including droughts and fires as well as such factors as global temperatures, rainfall amounts and volcanic eruptions.
Understanding these processes is key to forecasting annual CO2 increases, thus providing important information for future CO2 management. NOAA's Carbon Cycle Research Program, which includes surface-, ocean- and space-based measurements of CO2 and other important atmospheric gases, is aimed at developing a comprehensive picture of how CO2 is stored and released. The carbon-cycle studies are a part of NOAA's Climate Program, an integral part of the U.S. Climate Change Science Program.
"Reducing scientific uncertainties of carbon sources and sinks is a priority for the Climate Change Science Program, as carbon dioxide is the single largest forcing agent of climate change," said James R. Mahoney, NOAA deputy administrator and CCSP director.
NOAA scientists have been tracking CO2 levels around the world for more than 25 years. The oldest record comes from the Mauna Loa Observatory, which is located atop a Hawaiian volcano. There, Charles Keeling began CO2 measurements in 1958. Following NOAA's formation in 1970, measurements continued at Mauna Loa and began at other places around the world. There are now more than 60 monitoring sites worldwide.
Mahoney adds, "The measurement capabilities established at NOAA's Mauna Loa and other sites around the world demonstrates the importance of observational networks as a contribution to understanding the complexities of the carbon cycle."
Each year since global measurements of CO2 began, the amount of carbon dioxide in the atmosphere has increased.
Scientific measurements of levels of CO2 contained in cylinders of ice, called ice cores, indicate that the pre-industrial carbon dioxide level was 278 ppm. That level did not vary more than 7 ppm during the 800 years between 1000 and 1800 A.D.
Atmospheric CO2 levels have increased from about 315 ppm in 1958 to 378 ppm at the end of 2004, which means human activities have increased the concentration of atmospheric CO2 by 100 ppm or 36 percent."