All that crap coming out of the nuclear towers?
It's just steam, no CO2.
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Time Enough For Love, by Robert Heinlein
The cloud making machines!
it actually is steam. they generate power by heating water and letting the vapour turn turbines.
Whoever made this was an uneducated fear-mongering eco-idiot.
Aliens would also thing penises/vaginas are primitive. who knows what funky sex organs they have.