Instructions: Given a text, write a compressed version of it in a single sentence.
Input: The 1996 Base Year inventory was used to project future emissions under the Base Case and differences between the Base Case and the Clear Skies Act. It was constructed using existing emissions inventories created for various recent rulemaking activities.
Output:
The 1996 Base Year inventory was used to project future emissions under the Base Case. It was constructed using existing emissions inventories.