What's the name of this episode on the Discovery/History Channel?

I remember that about 1 1/2 to 2 years ago, the Discovery or History channel gave an episode on an asteroid hitting the Earth. There was a girl with a golden retriever girl who went into a cave because the asteroid started falling. Then there was another girl who lived in France and the whole country froze since the asteroids fumes blocked the sun. The outcome of the story is that the girl with the dog found her mother with other people in a small town they constructed. After this episode, came another episode on how life would be in 2056. Whats the name of both episodes? 10 points to the best answer.