Q: Given a text, write a compressed version of it in a single sentence.
We agree that climate change is a serious issue we need to address. However, CO2 has never been regulated as a pollutant under the Clean Air Act and does not pose any direct threat to human health unlike NOx, SO2 and mercury.
A:
Climate is a serious issued to be addressed. CO2 has been regulated as a pollutant under clean Air Act & don't pose any direct threat to human unlike NOx, SO2 & mercury.