The world was six degrees warmer that it is now. The World could only sustain 10% of the species alive now. Huge firestorms swept the planet. The seas contain no oxygen and releases only hydrogen sulphide. Carbon Dioxide was 800 parts per million (ppm). Little of the planet is inhabitable in a way that mankind understands it now.  For the next 200 million years great forests grew. With each tree that grew and dies some of that Carbon was captured and remained in the ground. This slowly turned into coal. However most of our Carboniferous Coal was formed already - about 300 to 360 million years ago. Meanwhile, in the seas millions of years of plankton lived, died and settled on the bottom to slowly form Oil. Oil was formed in the Jurassic period some 200 to 145 million years ago. This was natural sequestration. The Carbon was locked away. Dinosaurs came and went 65 millions years ago.
55 million years ago it was five degrees hotter than it is now. Carbon Dioxide concentrations have fallen to 650ppm. Deserts retreat from the temperate zones and humanity begins to evolve. Much of the World remains uninhabitable but more species are evolving as the Planet cools. Methane hydrates are locked into the sea floor.  As the millions of years fell away the CO2 concentrations dropped away to 550ppm and the temperature fell to four degrees hotter than now. The sea level falls exposing the Nile Delta. The West Antarctica Ice sheet forms causing further sea level drops. Deserts retreat from areas we now call Spain and Portugal. Mankind moves south into the growing habitable zones. In Siberia permafrost forms. The permafrost locks in methane and more carbon dioxide.
More years pass as the temperature falls to three degrees higher than today. The CO2 levels fall to just 450ppm. Food growing areas expand into the tropics and sub-tropics. Deserts retreat even further. The Indus rivers forms in its present form from Glaciers forming in the Himalayas. Mankind stretches out along its length and prospers through the area. Storms in the tropics become less violent by half a category. The Amazonian ecosystem forms to replace desert and savannah. It soaks up CO2 like an enormous sponge. CO2 concentrations plummet to just 400ppm and the temperature falls to just two degrees hotter than today.  Acidity in the Oceans falls to levels we would recognise today. The Greenland Ice Sheet forms and the sea levels continue to fall. Whole new tracts of agricultural land form and mankind continues to flourish. The quantity and diversity of species on the planet double and double again. Polar Bears, Walruses and other ice-dependent mammals set up home on the Artic icecap.
As we move into the modern era of mankind the temperature drops to one degree hotter than now as the CO2 concentrations drop to 350ppm. Deserts retreat from the High Plains of what we call the United States. This area is opened to agriculture and mankind moves in. Mount Kilimanjaro gets its ice. The Gulf Stream switches on bring a warmer climate to Northern Europe allowing mankind to populate the more northern reaches. Coral reefs form around the globe. The sea level drops to create hundreds of tiny islands. Ice Ages came and went but CO2 levels remained low. Much lower than they are now. Much, much lower. | 
CO2 concentrations are 278 ppm. Europe has become overpopulated - such is the success of mankind. The amount of wood grown in Europe could no longer support the human population in that area. This lead to hardships and many people set sail to colonise the Americas.
