This course will present a comprehensive analysis of the global climate challenge and will substantiate and discuss the following: Global warming has accelerated in recent years, approaching 1.2 degrees Celsius warming from the preindustrial era. Humanity’s greenhouse gas emissions are the driver of the warming. Growing populations and increasing demand for resource-intensive goods and services have driven the dramatic emission growth over the last 50 years. Serious impacts are already occurring; much more serious ones appear inevitable. If warming is not limited to 2 degrees Celsius or less, uncontrollable "hothouse" warming is possible, due to cascading tipping points. It will be a monumental challenge to limit warming to 2 degrees Celsius or less; the Paris climate accord is a modest but important first step. In the near term, aggressive actions are needed at the local, national, and global levels to limit the warming and the associated potentially catastrophic impacts. | Lecture + Q&A; Viewing videos.