The third and final full day of the symposium again included two sessions of talks. The first, entitled "A Comparative View of Climate Engineering Options and Metrics," was aimed at taking a good look at the concepts and terms we use to evaluate and assess different types of CE technologies to establish if researchers from different fields, countries and disciplines are assessing the technologies in a comparable way.

This week's symposium aims to deal with a wide spectrum of Climate Engineering related questions, but today's session focused on what is arguably one of the most fundamental of them all: Could we do it? Entitled "Scientific Feasibility of Climate Engineering Ideas," the first session of the week included talks by seven natural scientists and engineers who addressed the "Could we?" question from different perspectives.