Greenhouse gases have had a significant impact on the environment.
A compound subject for impact would have to be two words that are subjects in the beginning of the sentence and the word impact would have to be in the sentence somewhere.
Yes correct.
We share their plan through tv screens, and their ravages impact our emotional and economic health.
Can you use the word concluding in a sentence? Done.
You can use the word Truss in a sentence like this.
Just use it! Or do you mean, can you use the word beheld in a sentence.
Brace for impact - we'regoing in!Please hand me that impact wrench.
The impact of the closing that factory will be huge on the local economy.
"You're making a big impact in my life!" screamed Tiffany.
How do you use the word decibel in a sentence?What is decibel used for?
Since that is not a word I would not attempt to use it in a sentence.
You just did use the word colonize in a sentence.