<u>1) along its river because of fertile soil they found </u>
<em>Reason</em>: They found it easier for them not to frequently give water to the plants since it's already next to a river with fertile soil found this will help them grow various crops.
brainliest if u found it helpful~
The cause of global warming is the growing amount of greenhouse gases ... mainly carbon dioxide ... in the atmosphere. The rapid increase began at roughly the same time as the Industrial Revolution, when the mining and burning of coal on an industrial scale began. The concentration of carbon dioxide in the atmosphere is now the highest in several million years, and is increasing faster than at any time in the past that can be analyzed.