After agriculture, logging is the human activity that has most reduced carbon storage in vegetation and soil. Although harvested wood releases carbon into the atmosphere at different rates, the fact that growing trees absorb carbon has led to different approaches to accounting for the carbon in wood use, resulting in widely varying estimates of carbon costs. Many approaches give the impression of low, zero, or even negative greenhouse gas emissions from logging because they compensate in various ways for carbon losses from new logging by sequestering carbon from the growth of large forest areas. (Liqing Peng, Timothy D. Searchinger, Richard Waite)