Extreme heat pushing global food systems to the brink, UN agencies warn

Of all the ways the world has entered a new era, one of the most consequential yet least discussed is unfolding beneath the ocean’s surface. The planet’s warm-water coral reefs are dying at an unfathomable speed and scale: as much as 40% in the last three years, equivalent to all the dieback of the previous five decades combined. Picture a plasma screen TV reverting to black and white, or a field