Mauna Loa has been producing a readout which supports Manning's predetermined goal by showing steady growth in atmospheric CO2 concentrations since 1959. This record, highlighted in Al Gore's discredited movie An Inconvenient Truth, is known as the Keeling Curve. A graph of the curve is engraved on a bronze plaque mounted at the entrance to the Observatory’s Keeling Building, 10,000 feet above sea level on the rocky north flank of Mauna Loa. According to the Observatory website: "The undisturbed air, remote location, and minimal influences of vegetation and human activity at MLO are ideal for monitoring constituents in the atmosphere that can cause climate change."
For some reason, they fail to mention the erupting volcano next door.
The article discusses several other observatories that measure atmospheric CO2 downwind from active volcanoes, and even the one in Antarctica has a similar problem:
The South Pole Observatory is just yards away from a power plant which burns jet fuel 365 days a year to provide electricity and heat for Amundsen Station. (Researchers claim that prevailing winds come from the opposite direction.) It is also about 800 miles from Antarctica's Mt. Erebus volcano, which has continuously erupted since 1972. Because the atmosphere's ability to carry water vapor is cut approximately in half by every ten-degree-C drop in temperature, the extremely low temperatures at the South Pole mean that only trace amounts of water vapor are in the atmosphere. CO2 mixes with water vapor in the atmosphere to form H2CO3 (carbonic acid), giving rainfall a slightly acidic pH and washing CO2 from the air. The uniquely dry and cold conditions of the South Pole prevent this from occurring, thus altering the natural atmospheric carbon elimination process and magnifying the effect of CO2 sources. Amundsen Station personnel and emissions from the 12,000-foot Mt. Erebus volcano are also implicated in the 1990s ozone hole scam.