<p>This meta-analysis explores the transformative potential of biochar in agriculture by examining its effects on greenhouse gas (GHG) emissions. Analyzing data from 252 field studies, the research assesses biochar’s influence on soil physicochemical characteristics and its role in adjusting GHG emissions across maize, wheat, and rice. Special attention is given to various biochar application methods and rates, exploring diverse effects across different crop types. Using biochar alone (B) increased CO₂ emissions in maize and paddy fields by up to 8.47%, while reducing emissions in wheat fields by 17.39%. Conversely, combining biochar with fertilizers (BF) occasionally increased CO₂ emissions. CH₄ emissions decreased by as much as 64.71% in wheat when biochar was applied alone, but varied for rice and maize. N₂O emissions saw reductions across all crops, with a maximum reduction of 32.17% in paddy fields with biochar alone. Additionally, the global warming potential (GWP) was notably decreased in wheat by 41.47% with BF. Crop yields saw significant increases, particularly in wheat, showed a 35.18% improvement with BF treatment. The greenhouse gas intensity (GHGI) was dramatically reduced, especially in wheat fields where BF treatment resulted in a 75.61% reduction. Biochar application improved soil carbon-nitrogen ratios and nutrient cycling, significantly enhancing soil quality and contributing to sustainable agricultural practices. Rational application of biochar with different properties can effectively reduce agricultural GHG emissions while increasing crop yields, and the application strategy should be optimized according to crop types, soil conditions and other relevant factors.</p>