Carbon dioxide of fossil fuels and deforestation have caused the atmospheric concentration of carbon dioxide to increase by about 43% since the beginning of the age of industrialization. Most carbon dioxide from human activities is released from burning coal and other fossil fuels. Other human activities, including deforestation, biomass burning, and cement production also produce carbon dioxide. Human activities emit about 29 billion tons of carbon dioxide per year, while volcanoes emit between 0.2 and 0.3 billion tons. Human activities have caused to increase above levels not seen in hundreds of thousands of years. Currently, about half of the carbon dioxide released
Center for the Study of Carbon Dioxide and Global Change Center for the Study of Carbon Dioxide and Global Change The Center for the Study of Carbon Dioxide and Global Change is a 501(c)(3) non-profit organization based in Tempe, Arizona. The Center produces a weekly online science newsletter called "COScience". The Center was founded and is run by Craig D. Idso, along with Sherwood B. Idso, his father, and Keith E. Idso, his brother. They came from backgrounds in agriculture and climate. According to the Idsos, they became involved in the global warming controversy through their study of earth's temperature sensitivity to radiative perturbations and plant responses to elevated CO