Nearly 200 countries just agreed to protect 30 percent of the planet’s land and oceans by 2030 — a leap from the 16 percent of land and 8 percent of seas currently safeguarded. The deal, struck in the early hours of a December morning in Montreal, also commits wealthy nations to send $30 billion a year to developing countries for nature protection. Crucially, Indigenous communities — who steward an estimated 80 percent of the world’s remaining biodiversity — won language protecting their land rights and traditional knowledge in how these areas are governed. Past pledges have faltered, and enforcement remains the open question. But for a world losing species at rates unseen since the dinosaurs, having nearly every nation in one room agreeing to reverse course is a milestone worth marking.