which is a natural factor that causes long - term climate change?\nearths position\npollen…

Brief Explanations:

The Earth's position relative to the Sun (e.g., changes in its orbit, tilt) can cause long - term climate changes over thousands to millions of years. Pollen grains are mainly used for paleoecological studies, fossils are remnants of past life, and ice cores are used to study past climates but are not causes of long - term climate change.

Answer:

Earth's position