N-Johannes,
You really need to go to a public library and read some basic books about the Solar system.
J-I have read some basic books about the Solar system. From those books I obtained the idea that the solar system was formed when the hot gasses that now form the Sun cooled down, condenced and left remnants that cooled down further to form the planets. May have been an antiqueted idea but still makes sense to me.

N- A lot of your questions are glaring admissions that you know nothing about the topic.
J- I may not be as informed about the subject as you, but I believe that the word 'nothing' goes a little too far in explaining my ignorance. If you know all the answers and are too selfish to tell me, then please at least point to the source where I can find them.

N-It's barely worth telling the answer to any question since you don't appear to understand enough about physics to understand the answer,
J-I do believe that I understand Einstein's general theory of relativity. I'm sure you know the one that states that the guantity of energy is equivalent to the mass times a constant (speed of light) raised to its second power.

N-and you just go and ask another dumb question in return.
J- The only way to enlighten oneself is to ask pertinent questions.

N-My advice is that you do the reading I mention above, also look up lost of NASA resources on the Internet, and then lurk more and ask less...
J-Yes that is one way to understand what others think, but by directing questions to individuals I also learn what they think.

N-Regarding CO2, the response time of CO2 transformation to carbonate is a few tens of million years for an entire planet's supply.
J-From the information that I have gathered here I get the idea that the Earth had lots of CO2 in its atmosphere in the beginning and the rain washed most, if not all, of it into the rocks. (short explanation) Then came animals an started putting it back in.

N-The time elapsed between the formation of the Earth (4.6 BILLION years ago) and the time of the dinosaurs (300 million years ago) is 4.3 BILLION years.
J-Surely enough time to take all CO2 out of the atmosphere. I wonder where the proof is.

N-No anomalous CO2, no funny atmosphere, no bouyancy. (did you know we have samples of the dinosaur's atmosphere trapped in bubbles in amber?)
J-No, I did not know that samples of such old atmosphere was available for examination. It would be interesting to know what the actual atmospheric gas ratios and pressures were in those days, as compared to todays atmosphere.

Thank you for the reply I now know more about you and your vision of the universe than I did before.

Cheers
Johannes