S 3 If we are correct and both Venus and our planet composition is very similar, then as our planet is slightly larger than Venus.

         That would indicate that we have underestimated how much carbon has been sequestrated over the 3,000,000,000 years of abundant carbon-based life on the planet, by almost 100,000,000 gigatonnes. Is this of any real importance, and if so in what way? It is in that, when the Siberian traps were active for upwards of a million years, the carbon that was being expelled into the atmosphere was more likely coming from carbon that had been sequestrated, and forced under the tectonic plates as they collided, instead of coming from carbon raising over the plate collisions.  How active is tectonic plate movement on the planet, now that much of the radiation-induced heating has been half-lived in the 4.5 billion years, relying more on mass and gravity for internal heating and tectonic plate movement, than the nuclear-induced fission process? I personally do not worry too much about whether or not there are only 100,000,000, gigatonnes of carbon or 200,000,000 gigatonnes of carbon sequestrated on Earth, that question is much more for academic-based knowledge, than the need on how to repair the planet.                                                                                               Scientists have told us how to repair the planet, 1) stop our carbon footprint by becoming "greener" and 2) by reducing the amount of carbon dioxide in the atmosphere, in the hope of keeping temperature rise to less than 2 degrees Fahrenheit. All without a plan to do either in a timely and cost-effective way! The "plan" will do everything that scientists wish to be done, even if they have not come to the realization, of what all carbon-based life on the planet is facing. As our knowledge grows, many things that we believe we understand now will become, less likely to be true, but the new knowledge will help us understand the nature of life on the planet! Dan