This is a seven-day New York Times crash course on climate change, in which reporters from the Times’s Climate desk address the big questions: 1.How bad is climate change now? 2.How do scientists know what they know? 3.Who is influencing key decisions? 4.How do we stop fossil fuel emissions? 5.Do environmental rules matter? 6.Can insurance protect us? 7.Is what I do important? New York Times