A possible environmental impact of surveying for coal is that you could litter. Maybe you dropped a wrapper from your lunch and didn't notice anything so it was left their. It won't decompose for a long time so this is hurting the environment.
A possible environmental impact of removing trees and clearing the landscape could be that you are taking the trees out of their natural environment and knocking them down.
An environmental impact of digging a hole in the ground to get to the coal is that you could be disrupting animals homes or even taking their homes away from them.
An environmental impact of digging up the coal from the ground is that you could be contaminating the water from underground and above ground. This could cause harm to the people relying on that water for their homes.
An environmental impact of transporting the coal to the plant could be the possibility of a spill. The coal is piled very high in the truck and if it spills that could hurt the environment.
An environmental effect for burning coal is that it releases a lot of toxins into the air such as Co2 which are not good for us to breathe in.