List of the left wing's phony scare stories

Prager is looking for a list of phony science scare stories. I have a few suggestions:

Anthropogenic global warming
Silicon breast implants
Second-hand smoke
The Y2K disaster
The vanishing American forest
American toilet paper is made from old growth trees
Overpopulation
DDT
Tampons
Heterosexual AIDS
H1N1
Infant vaccination
Condoms cure everything and prevent everything
Sex education cures all sexual problems
We need sex ed in kindergarten
It's a fetus, not a person
It's a blob of undifferentiated tissue
If abortion is not legal, there will be thousands of deaths a year from attempts at self-abortion
If we fund embryonic stem cell research, Christopher Reeve will walk again
Ethanol is an excellent fuel for cars
Electric vehicles don't pollute
Compact Fluorescent Lights are good