Intensify drought and hurricanes in the region (these usually cause climate change) hope this helps and i hope I’m right please let me know lol
This should be an example of genetic drift.
The brown spotted deer would spread their genes more than the white spotted ones which would eventually lead to them completely overpowering genetically the white deer in future generations.
Carbon dioxide, methane, water vapor, and a few other atmospheric gases trap heat energy and maintain earths temperature range
Globalized evolution...... but I might be wrong