MZIMBA, Malawi – For years, life was defined by hardship for Grena Banda and her husband, Daniel Mwafulirwa, in Malawi’s northern district of Rumphi. Their small farm was their only reliable source of livelihood, yet it rarely produced enough. Climate change brought erratic rainfall, sometimes drought and sometimes heavy downpours that washed away fragile topsoil. At the same time, the cost of fertilizer kept rising beyond their reach. Each farm…