In an effort to reduce regulatory burdens on U.S. industries, President Trump is reversing or weakening federal climate change policies and regulations. The rollback has sparked legal challenges from environmentalists, health advocates and Democratic leaders, as well as heightened criticism from the international community. The administration’s actions come as scientists warn of increasingly intense storms and wildfires, rising sea levels and other effects of global warming. Courts are beginning to rule on challenges to the administration’s deregulatory actions, providing support to opponents in several cases. Meanwhile, some states are undertaking initiatives to help the United States comply with an international climate accord despite the president’s decision to withdraw from the pact.