You are referring to the university expert in earth science who I cited. You would have to know math and science to know how scientists date geologic events. If you need help, feel free to ask. This was to correct your reference to the jet stream in your OP: The link I gave you explains the origin of the jet stream. This was to correct your error: The Aurora Borealis is merely a display of light, not a source of weather. That's incorrect, apparently stemming from your misunderstanding about solar energy absorption. The Earth orbit decays at an insignificant rate. Orbital decay won't matter when the Sun expands past our present location and engulfs the Earth. It's not my theory. It's the result of decades of climate science, thanks to folks like the ones at NOAA whose work you would need to study in order to begin to understand climate science. Let's begin with the fact that winter in one hemisphere is accompanied by summer in another. Does that help? Climate change involves the net increase in heat of the entire mass of air surrounding Earth, regardless of what's happening on the ground. The increase in energy absorbed into the atmosphere raises its average temperature. Solar IR radiation is the part of the spectrum which causes the average air temperature to rise. That's irrelevant since there is always the same average mass of air facing the sun at any moment, regardless of seasonal changes on the ground below. Climate change concerns itself with the total amount of energy in the whole air mass. It's increasing. This causes the average air temperature to rise globally. You're referring to the incident solar angle, which varies ±23.5° on the ground - a total variation in 47° - per annum. This has no bearing on the total energy absorbed into the atmosphere, which depends on atmospheric chemistry. If the winters are sunny, it's due to lack of local clouds, also irrelevant to average global air temperature. During winter in North America, it tilts away from the sun by 23.5°, exposing less land area per watt of solar energy. The Southern Hemisphere tilts toward the sun, absorbing more energy and bringing summer. But this is irrelevant. The temperature increase is due to increased absorption of solar energy into the air mass, not the position of a particular site on Earth. That's irrelevant. And the axial tilt has not changed for eons. Greenhouse gases are produced continuously by human activity, constantly increasing the heat absorption of the atmosphere, thereby continually elevating the average temperature of the total air mass. Seasonal climate changes at a particular location are irrelevant.