Photos: D.I. Also, on a personal level, I find this to be an exemplification of the (to me) apparent fact that "what we are for" on this planet, is to "help out" the planet "work", not drive towards individualized  "wealth". Perform the same tests through an extended archway with a specified rate of air flow through it, measuring the humidity and depletion % of CO2 in the air at the exit. How about potash (potassium salts). This happened due to tectonic activity and volcanic eruptions exposing silicate rocks … They used a first numerical model to estimate future climate change, doubling the amount of CO2 in the atmosphere (a level likely to be reached by 2100). Now we come to the weathering. Photo: author. Many thanks - we'll get this fixed ASAP! The compounds making up the vast majority of Earth's land surface - the minerals that make up rocks - are, by and large, very slow to react. It's worth adding (I'm not sure if & how well you're going to explain it later) this rock weathering process is also considered to be primary planetary thermostat. Of these, 87Sr is radiogenic, which means that it has been formed by radioactive decay of an unstable isotope of another element, in this case rubidium 87. above: slate-grey, relatively unweathered late Ordovician mudstone, typical of the rocks of Mid-Wales. 2020 Jul;583(7815):204-205. doi: 10.1038/d41586-020-01965-7. These minerals do not have a fixed composition: in feldspars, for example, sodium, potassium and calcium (and other) atoms can substitute for one another, and the exact composition of the feldspar crystal depends upon both the composition of the melt from which it crystallised and the temperature and pressure at which it did so., For the denialists, you'll need to explain, how nearly all geologic records were created by one global flood. The slate-grey colour has been changed to pale pinkish and buff shades. The resulting solution, which reaches the surface as rainwater, is weakly acidic: CO2 + H2O = H2CO3 (or carbonic acid - the old name for carbon dioxide was carbonic acid gas). These are calcite (trigonal) and aragonite (orthorhombic). The answer is almost certainly glaciation. Do you think that the principle mode of ocean CO2 absorption occurs directly across the surface of the ocean, or do you think it may significantly  derive from rainfall and ocean spray? However, once there have been responses and evolution of the thread, generally moving it causes more problems of meaning. Put simply, hydrogen ion activity within a solution is a measure of its acidity: the more active hydrogen ions in a solution, the more acidic it is and the better at dissolving other compounds. Several things stand out in this plot, of which the most drastic is the precipitous fall in CO2 levels beginning around 375 million years ago during the Devonian, this marking the wide colonisation of the land by photosynthetic plants. If you COULD capture 100%, you most definitively would not want to, as downwind vegetation would be significantly affected. Why? Where would the gigantic amount of energy come from? 1. By dividing the original cube up into all these little ones, we have increased the surface area available to react by a whole order of magnitude. )..THAT's the question we each should be continuously tryiung to answer and act on. The most technically viable geoengineering answer seems to be injecting large volumes of aerosols into the atmosphere to reflect sunlight and cause some cooling. The scientists found that when the amount of atmospheric CO2 rose from 355 ppmv  (at the end of the twentieth century) to 560 ppmv (by 2100), the Mackenzie River basin responded by capturing 50% more atmospheric CO2 through chemical weathering. What do you think happens to mists of neutral water collected in a tray after falling through 8 feet of fall?