The Green Revolution significantly increased agricultural productivity in India through the introduction of high-yielding varieties of wheat and rice, increased fertilizer and pesticide use, and improved irrigation techniques. Led by Indian agronomist M.S. Swaminathan and supported by Mexican scientist Norman Borlaug, the Green Revolution transformed India from a food-deficient nation in the 1960s to a major food exporter by the late 1970s through high crop yields that established India as one of the world's largest agricultural producers. However, overuse of chemicals polluted water sources and soils over time. Future agricultural plans need better management of irrigation and controls on pesticide and fertilizer use to minimize environmental impacts.