What is the fine-grained topic of the following text: Here is Elizabeth Kolbert's groundbreaking essay "The Darkening Sea," Michael Crichton's skeptical view of climate change, George Monbiot's biting indictment of those who are really using up the planet's resources, NASA scientist James Hansen's testimony before the U.S. Congress, and clarion calls for action by Al Gore, Arundhati Roy, Naomi Klein, Van Jones, and many others. Only return the topic.
Climate change views and testimonies