The rational approach of the genuinely curious is to ask questions and try to understand what that graph is telling us. Where did all that CO2 come from? What was going on back then? Why did it peak and then drop, then slightly rise again only to fade down hill again? How does it relate to today's Earth? Where's that graph from (no citation was offered)? What does the attached study discuss? What's the margin of error in that data set? ect. All interesting stuff you need to know about before you begin to have any inkling of what's going on. That's why we have experts, people who have committed themselves to full time study and reporting back to us regular folks.
580-500 Ma (million years ago) - Most modern phyla of animals begin to appear in the fossil record during the Cambrian explosion.
560 Ma - Earliest fungi
535 Ma - Major diversification of living things in the oceans: chordates, arthropods (e.g. trilobites, crustaceans), echinoderms, mollusks, brachiopods, foraminifers and radiolarians, etc.
530 Ma - The first known footprints on land date to 530 Ma, indicating that early animal explorations may have predated the development of terrestrial plants.
505 Ma - Fossilization of the Burgess Shale
485 Ma - First vertebrates with true bones (jawless fishes)
432 Ma - The first primitive plants move onto land, having evolved from green algae living along the edges of lakes. They are accompanied by fungi, which may have aided the colonization of land through symbiosis.(Have you ever tried to imagine a landscape, where there was only rock and water, the only sculpting forces: tectonic activities, gravity, wind, water, tides, and temperature. Nothing to hold gravel, sand and silt in place, other than being buried. That's what we had on Earth for some four billion years. It's revelations such as these, along with their implications, that make evolution such a fascinating intellectual adventure no matter what level of understanding you are at.)
363 Ma - By the start of the Carboniferous Period, the Earth begins to be recognisable.
360 Ma - First crabs and ferns. Land flora dominated by seed ferns.
280 Ma - Earliest beetles, seed plants and conifers diversify while lepidodendrids and sphenopsids decrease. Terrestrial temnospondyl amphibians and pelycosaurs (e.g. Dimetrodon) diversify in species.
251.4 Ma - The Permian–Triassic extinction event eliminates over 90-95% of marine species
225 Ma - Earliest dinosaurs (prosauropods), first cardiid bivalves, diversity in cycads, bennettitaleans, and conifers. First teleost fishes. First mammals (Adelobasileus).
220 Ma - Seed-producing Gymnosperm forests dominate the land; herbivores grow to huge sizes to accommodate the large guts necessary to digest the nutrient-poor plants. First flies and turtles (Odontochelys). First coelophysoid dinosaurs.
130 Ma - The rise of the angiosperms: These flowering plants boast structures that attract insects and other animals to spread pollen. This innovation causes a major burst of animal evolution through coevolution.
80 Ma - First ants - (a monumental moment for soil creation/fabrication)
66 Ma - The Cretaceous–Paleogene extinction event eradicates about half of all animal species,
35 Ma - Grasses evolve from among the angiosperms; grasslands begin to expand.
10 Ma - Grasslands and savannas are established, diversity in insects, especially ants and termites, horses increase in body size and develop high-crowned teeth, major diversification in grassland mammals and snakes
Robert M. Hazen, Dominic Papineau, Wouter Bleeker, Robert T. Downs, John M. Ferry, Timothy J. McCoy, Dimitri A. Sverjensky, Hexiong Yang