Original sentence: Environmental groups and public figures have launched campaigns emphasizing the risks.Fossil fuel organizations and companies such as American Petroleum Institute and ExxonMobil, represented by individuals such as Philip Cooney and some think tanks such as the Competitive Enterprise Institute and the Cato Institute, have campaigned to downplay the risks of climate change, described by some as climate change denial
Edited sentence: Fossil fuel organizations and companies such as American Petroleum Institute and ExxonMobil, represented by Philip Cooney, and some think tanks such as the Competitive Enterprise Institute and the Cato Institute have campaigned to downplay the risks of climate change, described by some as climate change denial,.while environmental groups and entertainers have launched campaigns emphasizing the risks