On Aug. 9, the Intergovernmental Panel on Climate Change (IPCC) published the first installment of its latest report assessing the state of scientific knowledge about the climate crisis. As United Nations Secretary-General António Guterres put it in a press release, the report is nothing less than “a code red for humanity.” The good news is that the science indicates that there is still time to respond by taking drastic and rapid action to shift from fossil fuels to clean, renewable energy and to keep people safe in the face of the dangerous changes in the climate system that have already taken place. That will be expensive, and a group of senators led by Sen. Chris Van Hollen (D-Md.) plan to introduce legislation based on the well-established legal and moral principle that those who cause damage should pay for it.