What would the contour lines look like in an area that is very steep?

They would be very close together the farther apart the lines the less steep the closer together the more steep the terrain.

Increasing the release of greenhouse gases and pollution

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.