Former President Reagan defined a recession as when your friend lost his job, and a depression as when you lost your job. Collapse is when no one has a job; in fact there are no longer any such things as jobs to be had. Various types of doomers/collapsitarians/dystopians:
* Luddites, anarchists, and anti-civilization activists who are trying the hasten collapse as soon as possible.
* Survivalists: collapse as the penalty for modern liberalism.
* Radical environmentalists who see ecological and environmental collapse
* Anti-globalists who see collapse as the penalty for globalism.
* Anti-Americans rooting for collapse of America and developed world
* Financial doomers: who see the never ending Depression
* Peak Everythingers who see all resources running out
Plenty of other places online describing these scenarios of decline, war, and collapse to 0 to 2 billion people starting as early as this year and usually by 2025 but no later than 2100. One thing of note is that most people usually think that Hitler and Stalin were bad guys for killing or causing the death of about 100 million people. Most of the civilization die off scenarios are that level of death each and every year for 70 years. 1000 times the number of deaths in the holocaust. Why is there the belief that significant mitigation efforts would not be made?
