Over the last 30 years predictions of climate change as a threat to individuals, societies and nations have changed from possibilities to realities. Ethical issues associated with individuals, companies, nations which cause climate change, who might benefit from it, and who will suffer from the impacts have been part of the discussion from the beginning. How has thinking about the ethics of climate change evolved during that time and how does this relate to the ethics of extreme mitigation efforts like climate engineering? Margaret Leinen, UC San Diego Vice Chancellor for Marine Sciences, Director of Scripps Institution of Oceanography, and Dean of the School of Marine Sciences discusses what can be done, what is being done, and the ethical implications of deploying solutions. (#31033)