{'ecological imbalance': [0, 0, 0, 1], 'deforestation': [2, 0, 0, 2], 'rainfall variations': [0, 0, 0, 1], 'main cause': [4, 0, 0, 3], 'famines': [0, 0, 2, 2], 'desertification': [1, 0, 1, 1], 'floods': [1, 1, 0, 1], 'india': [8, 1, 7, 13]}