Bengal Famine of 1770 caused the death of 10 million people. Apart from drought, what was it caused by?

As lands came under company control, the land tax was typically raised from 10% to up to 50% of the value of the agricultural produce, and was raised even higher at the famine peek. Nevertheless, the company continued to suffer financially, and influenced Parliament to pass the Tea Act in 1773, which ultimately lead to the American War of Independence.