Famine:
People may not have enough nutrition later on.
Drought;
Farmers need to find new farmland and they can't grow crops near the droughts because it is too dry. Farmers may even need to migrate to other countries to start their farmland.
The famine was in the Land of Canaan (later called Israel), and they Hebrews migrated to Egypt.
Ireland had a potato famine and many fled to America because of food. The famine was later found to be a bacteria briught from Britain.
In Jacob's time: because of famine. Later: they were exiled by Assyria, Babylonia and Rome.
They initially migrated because of famine. later, migrations were always due to war and other political motivations.
impact of ecosystem has caused a great imbalance in nature which later leads to loss of biodiversity
"...THERE WAS A FAMINE IN THE LAND: and Abram went down into Egypt to sojourn there; for THE FAMINE WAS GRIEVOUS IN THE LAND." (Gen.12:10)This journey to Egypt in the midst of a great famine would be repeated by his grandson, Jacob and his family, later, when his son, Joseph [whom he thought to be dead], ruled there. (Gen.41-46)
The Cold War did not impact WW2 at all, because it happened later.
he is famous because he is an artist
Are you like eight or something? No, it has no impact.
At birth, the differences between humans are genetic. Cultural and experiential differences come later.
Mainly heat, cooking later
it will definitely affect the humans and all human settlements. Rather all the elements in the ecological chain has has its impact on each other. Take an example, if all lions dies, what will happen? the vegetarian wild life will grow at a speedy rate endangering the existence of forests and later may move to cultivations made by humans destroying it and making humans suffer for want of food. trees in the same line, if gets exhausted, will impact on human settlement in-terms of low rains, soil erosion, fast degradation of underground water streams etc. There's no limit to what can happen to human. All your imagination in this regard will happen to humans if all trees died.