“…The debatable issues include the effectiveness of NT to mitigate emissions (Neufeldt et al, 2013;Powlson et al, 2014;Sommer and Bossio, 2014), and the feasibility of adopting agricultural best management practices and upscaling to regional scale (Sá et al, 2013;Corbeels et al, 2016;Powlson et al, 2016). The contribution of NT management to mitigate climate change by C sequestration is perceived to be low presumably because: i) the capacity for soil C sink is finite (Sommer and Bossio, 2014;Adenle et al, 2015;Corbeels et al, 2016;Powlson et al, 2016;), ii) diverse crop sequences or combinations with worldwide adoption of NT promote variable effects of NT on crop yields at global scale (Pittelkow et al, 2014); iii) difficulty of obtaining credible estimates of SOC on landscape scale and requiring a complex framework encompassing a wide range of climate, soils (texture, mineralogy), crops and cropping systems which exacerbate uncertainties in assessing C sequestration (Sá, et al, 2013;Sommer and Bossio, 2014;Adenle et al, 2015;Lam et al, 2013); iv) high risks of re-emission of SOC sequestered because even a single tillage event in a long-term NT soil may negate previous gains in SOC stock (Sá et al, 2014); v) a high variation and uncertainties of the C sequestration rates in fields under NT involving three conservation agriculture principles (FAO, 2014;Kassam et al, 2015) already practiced on b15% of the global cropland; and vi) low amount of the input of biomass-C return because of extreme weather events (e.g., long dry period or excessive rainfall).…”