AP Human Geography Models & Theories Practice Test 2026 - Free APHG Practice Questions and Study Guide

High-yielding crop varieties and their spread to developing nations sparked the Green Revolution. Norman Borlaug developed and promoted high-yielding, disease-resistant dwarf wheat varieties and led international breeding programs that brought these crops to Mexico, India, Pakistan, and beyond. This work, paired with improved irrigation and fertilizer use, dramatically boosted agricultural yields and helped avert famines. The other figures contributed to agriculture in important ways—Carver worked on soil improvement and crop diversification, Burbank bred fruit varieties, and Wallace played a role in agricultural policy—but Borlaug’s breeding programs and their rapid adoption are what specifically propelled the Green Revolution forward.