Seasonal changes happen because of the tilt of the Earth's axis, relative to the plane of the ecliptic.
1. The earth is tilted 2. the sun rays hit our earth at different angles causing temperature change
Global warming is causing climate change. There are many causes of global climate change. There is a feed back loop. As there are fewer glaciers and there is less sea ice, less sunlight is reflected...
The tilt in the earth's axis causes the earth to at different times, lean towards the sun