It’s hard to wrap your head around climate change. How do you really take in the concept of planetary change over decades or even centuries? Visual artist Kambui Olujimi explores different ideas about time in his one-man show “Zulu Time.”

Historian Iain McCalman’s Dangerous Idea? The Anthropocene — the idea that humans have fundamentally changed our global climate. It’s scary, but we’re also seeing people come together in unprecedented ways to solve planetary problems.