No. The earth has three different motions around the sun. It spins like a top. That is called precession of the poles. Sometimes the North Pole is closer to the sun in winter. Sometimes it is closer to the sun in summer. Its Orbit changes from round to oblong and back to round. And it has a third motion. When all three motions reach a certain point, the world receives less sunlight and the northern hemisphere receives less sunlight in winter. It gets so cold that winter snow does not melt. The next ice age caused by motions of the earth around the sun is scheduled for 200,000 a.d.
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The rising levels of oxygen in the Karoo Ice Age had major effects upon evolution of plants and animals. Higher oxygen concentration (and accompanying higher atmospheric pressure) enabled energetic metabolic processes which encouraged evolution of large land-dwelling vertebrates and flight, with the dragonfly-like Meganeura, an aerial predator, with a wingspan of 60 to 75 cm. The inoffensive stocky-bodied and armoured millipede-like Arthropleura was 1.8 meters long, and the semi-terrestrial Hibbertopterid eurypterids were perhaps as large, and some scorpions reached 50 or 70 cm. The rising levels of oxygen also led to the evolution of greater fire resistance in vegetation and ultimately to the evolution of flowering plants. Genetic studies have shown that this was when Angiosperms separated from Cycads and Gymnosperms.
No humans
No! Current scientific studies show that humans did not exist until 65 million years AFTER the dinosaurs became extinct! If we did exist before and when the dinosaurs existed, the dinosaurs would have killed us all off!
Yes, the glaciers retreated from most of the northern hemisphere, (except for mountain ranges and the Arctic), about 10,000 years ago, humans have been around for at least 250,000 years.