According to Buddhism, the main cause of suffering in the world is attachment and desire.
The main cause of WW1 was the assassination of Archduke Franz Ferdinand.
It was the main cause
The main issues of the immediate future are basic survival issues like food, water, and clean air. The melting of the world's glaciers is already leading to less fresh water in the rivers of the world.
Commerce
sometimes they have transportation issues but in my opinion the main cause is the use of the computers and cellphones until very late in the night
Why world's population has increased rapidly in last hundred years and main problems will cause?
George Washington
to make the world a better place
friendly fire
No, it was a factor, but the main cause of WW2 was, surely, WW1.
Poverty, drought, and civil wars.