Earth orbiting the sun causes seasons to change.
Climate changes across seasons can be explained by the tilt of the earth's rotation axis.
The direction the earth is tilted while it orbits the sun is what causes climate to change.
What determines the climate to change?

  exposure to cold
  Greenhouse gases
  the sun's energy
  degrees Celsius
  Greenhouse gasses
  organisms and their habitat
  Decreased precipitation
  The way the earth is tilted