Weather.

[bigpaul]

90% mortality rate is the average in any kind of major event risk calculation, the real death rate would probably be much higher as modern life has lost most of its connection to land and the growing of food, in the UK it has been said be are 4 generations removed from the land, a generation is usually taken as about 30 years.
most people are so reliant on modern food deliveries they would perish within a short time frame if ever these deliveries stopped.
government perception of risk is only about which party will win the next election.