As Russia’s war in Ukraine rages on, this year’s MIT Energy Conference spotlighted the role of geopolitics in the world’s efforts to lower greenhouse gas emissions and mitigate the worst effects of climate change. Each year, the student-run conference, which its organizers say is the largest of its kind, brings together leaders from around the globe to discuss humanity’s most pressing energy and sustainability challenges. The event always involves perspectives from the investment, business, research, and startup communities. But this year, as more than 600 attendees gathered on April 11…