Well mankind frequently causes devastation to our planet and to the people. I think many of the things that are commonly brought up are things like World War 1 or 2 have caused tens of millions of deaths while these are certainly disasters I will throw out a few that may not be so commonly thought of.
- Killer Fog - 1952 London, when a freezing cold winter caused everyone to burn more coal than normal and it created a sulfur dioxide, and nitrogen oxide killed about 12,000 people.
- Chernobyl Meltdown - 1986 Chernobyl Russia, when the reactor melted down it release radioactive material four hundred times more powerful than Hiroshima. The damage from that one has caused over 100,000 cancer deaths alone.
- Union Carbide Accident - 1984 Bhopal India, when a leak of methyl isocyanate gas was released exposing over a half a million people with around 15,000 deaths.
While not to the extent of millions of deaths the point is we are killing ourselves with all the chemicals we create, and consume.
Probably one of the worst problems we are causing is the invention of - Processed Food and lifestyle that is making us obese and causing a ton of health problems. With Obesity and Diabetes leading the list of health problems. About 3.5 million people die from Diabetes each year. So if you figured the next 10 years roughly 35 million people will die from it. Not to mention all the other problems like amputations, renal failure and blindness. It is a huge train wreck.
The list can go on and on about all the ways we are killing ourselves and each other.