Catastrophic Disasters that could have been prevented

Brief and define each question

Fukushima Daiichi nuclear power plant accident in 2012

1. What happened-background

2. What was the cause?

3. What were negligences?

4. What went wrong with the safety measures taken?

5. What was the impact & destruction to human lives?

6. What was the impact on the environment?

7. Could this have been prevented? How?