How many times are we going to have to listen to these doomsday theories?
I'm just older middle aged, but I was almost convinced of a mini-ice age in the 70's, except it didn't.
Population was going to cover the world to a depth of 6 feet by now, but it didn't.
Plastic was going to be 2' deep over the entire land, but it isn't.
Nuclear winter - how close is the clock today (for the last 20 years)?

Everyone of them were scientifically proven and sure to happen according to some group with too much free time.

Then there are the faith based equivilent.
The rapture - I forget the date.
The Mayan proffecy (sorry I can't spell) - sorry, we must have misunderstood the stone tablets, but wait for next year.
2000. What a fissile.
Probably a lot more I didn't ever hear of.

The basic flaw with the Venus fantasy is that Venus is a lot closer to the sun than we are so it naturally is hotter. Mars is farther away so it is colder. Just like the three Bears, Earth is just right. We have geological proof that ice ages and hot ages come and go. The planet will be just fine. Humans might get a little uncomfortable and have a little die back - hopefully not like the Dinosaurs.

Wake me when you have another Science fiction disaster to talk about.

Believe in my solution - Move to Northern Canada - Now! Not to my neck of the woods, please.