IF humanoids killed off the dinosaurs with an Asteroid from the blown up planet out past mars:

They probably did this so they could migrate to earth and not be eaten that easily by Tyrannosaurus Rex and other carnivores at that time. Also, even something like a Brontosaurus which is a vegetarian could accidentally step on someone and they would be gone too. I've had a Belgian horse I was riding step on my foot with a 12 inch across hoof and I was worried he was going to break my foot through my tennis shoe but luckily because I had the shoe sideways with the bottom facing left instead of down the the rubber shoe bottom kept my foot from breaking.

So, my thought is that humanoids have been here on earth off and on for 65 million years. However, I think most humanoids would leave earth for warmer climes on other planets during ice ages.

However, I'm thinking as an intuitive that we lost space travel once during Mu and Lemuria from an interplanetary war of our colonies attacking us. And we lost it again during Atlantis too but I don't think we traveled beyond our solar system during Atlantis.

So, we were without space travel for maybe 10,000 years? this last time.

I think Ice ages average every 200,000 to 500,000 years.

And the global warming we are presently witnessing likely will bring the next ice age I would say within 1000 to 5000 years time.

Note: Global Warming ALWAYS precedes an ice age. Talk to any PHD in weather science if you don't understand this.

So, hopefully we find another planet to go to to stay warm. If not, I guess we move underground like many animals to stay warm during the ice age.

IF AN ICE AGE COMES:

It likely in the U.S. the ice and snow would completely cover Canada and Alaska but in places like California it would start at the Sierras and extend eastward to the Appalachian mountains. It wouldn't be ice near the oceans because the oceans hold too much heat. So, you would have this ice and snow shelf from the Sierra Mountains eastward across the rockies and Great Plains ending at the Appalachian Mountains.

So, I'm thinking the ice would come down as far as maybe Albuquerque, New Mexico and across that line over to maybe Georgia or something. But, it wouldn't extend beyond the Appalachians or down into Florida. But, Florida likely will be an island or something with Miami Gone possibly by 2100 already because of rapid Ocean rise from ice melting all over the earth.