Climate change has already started to damage the U.S. economy, environment, and human health, and some future damage is now unavoidable (locked-in), according to this report from 13 U.S. government agencies. The Physics Today article points out that adaptation, mitigation, and suffering are all choices we are currently exploring. Volume I discusses the climate science, and Volume II discusses impacts risks and adaptation. The report discusses specific impacts on communities, economy, water, health, indigenous peoples, ecosystems and service, agriculture, infrastructure, oceans and coasts, and tourism and recreation. Much opportunity for adaptation and mitigation is still possible, and with aggressive action much could still be done to reduce the causes of climate change itself, as well the ensuing effects. Physicist-cartoonist Randall Munroe produced a nice related graphic cartoon examining the history of Earth’s “small” temperature changes since the last ice age 20,000 years ago, ending with our current...