"The population is growing"

[Rachel Adams]

Hello.
These sentences are from Michael Vince's English Grammar in Context. I was going to use the simple present but after reading the second sentence that follows the first one I thought it would be wrong to use the simple present. Am I right?
"The population of the world is not staying the same. At the moment it is growing at an increasing rate."

 

[Tdol]

I would not use the progressive form with the first.

 

[emsr2d2]

I'd use the progressive but with a different verb.

The population of the world is not remaining constant.

 

[Rachel Adams]

I'd use the progressive but with a different verb.

The population of the world is not remaining constant.

I thought the progressive is correct because it expresses the idea of change.

 

[Charlie Bernstein]

Hello.
These sentences are from Michael Vince's English Grammar in Context. I was going to use the simple present but after reading the second sentence that follows the first one I thought it would be wrong to use the simple present. Am I right?
"The population of the world is not staying the same. At the moment it is growing at an increasing rate."

Both look fine to me. It's not this, it's that. It's not staying the same, it's growing. Good parallelism.