The Federal Government of Nigeria has adopted Vision 20: 2020-an ambitious strategy to make Nigeria the world's 20th largest economy by 2020. In the absence of policies to accompany economic growth in key carbon-emitting sectors with a reduced carbon footprint, emission of greenhouse gases could more than double in the next two decades. To evaluate how to achieve the objectives of Vision 20: 2020 with reduced carbon emissions, the Federal Government of Nigeria and the World Bank undertook a multiyear program of analytical work. The summary results of this program are contained in a separate book (published in the World Bank's 'Directions in Development' series) entitled Low-Carbon Opportunities for Nigeria, which concludes that Nigeria can achieve its development objectives, while stabilizing emissions at 2010 levels and providing domestic benefi ts on the order of 2 percent of GDP. This volume is a collection of the background technical reports on the four sectors of agriculture and land use, oil and gas, power, and transport. It contains details on the data, methodology, and assumptions used throughout the analysis. For agriculture and land use, the study team developed an agriculture production growth model, which permits the evaluation of sector emissions in both a reference and a low-carbon scenario. The study fi nds that low-carbon practices have signifi cant potential to make the sector more productive and more climate-resilient. For the oil and gas sector, the analysis assesses the potential of accelerated phase-put of gas fl aring, reduction of leakages, and increased energy effi ciency in the operation of facilities, to both reduce the sector's emission and contribute to the industry's net revenues and growth. The analysis of the power sector shows how the country can expand power generation and broaden access to electricity while reducing associated emissions, through renewable energy, energy effi ciency, and lower-carbon technologies in thermal power generation. Finally, this analysis assesses the expected growth in CO2 emissions from on-road transport under a normal business development scenario up to the year 2035, and it identifi es actions at national and local levels that would reduce this growth, resulting in fuel economies, better air quality, and reduced congestion. Assessing Low-Carbon Development in An Analysis of Four Sectors outlines several actions that the Nigerian government could undertake to facilitate the transition to a low-carbon economy.