According to the ipcc (intergovernmental panel for climate change), 1.6 billion tons of carbon dioxide a year are released into the atmosphere due to deforestation. until the early 1900s, deforestation was the dominant source of increased co2 in the atmosphere. what has surpassed deforestation as the number one anthropogenic source of carbon dioxide emissions? a) volcanic eruptions b) cellular respiration eliminate c) livestock production d) burning of fossil fuels