New research finds that warm-bodied marine predators, including great white sharks and tuna, burn nearly four times more energy than cold-blooded species, a metabolic premium that becomes increasingly costly as ocean temperatures rise. Unlike cold-blooded fish that passively match ambient water temperature, these species generate internal heat to sustain speed and predatory performance, but that same physiology limits their ability to shed excess warmth. As sea temperatures climb, the gap between their internal heat load and safe operating thresholds narrows sharply. The compounding problem is nutritional: warmer oceans are disrupting prey availability, meaning these predators must eat more precisely when food is harder to find. Researchers frame this as a 'double jeopardy' dynamic, where thermal stress and caloric shortfall reinforce each other. Population-level consequences for apex predators would ripple through marine food webs, with downstream effects on commercial fisheries and the broader ocean ecosystems that underpin them. Migration range compression is a plausible near-term stress signal to monitor.
Iran's Revolutionary Guards have warned that oil tankers crossing the Strait of Hormuz without authorisation risk being stopped, even as one tanker proceeded through the waterway. The threat could push up war-risk insurance premiums and crude prices, with major importers like India directly exposed.
Iran and the US traded fresh strikes over the Strait of Hormuz, with Tehran hitting US bases in Bahrain and Kuwait and Washington striking Iranian sites near Sirik. The exchanges threaten to collapse a Pakistan-brokered ceasefire signed June 18, with global oil markets exposed to renewed Hormuz disruption.
Iran's IRGC struck US military facilities in Kuwait and Bahrain on Sunday for a third straight day, while Trump threatened Iran would "no longer exist" if the US resumes full war.
Venezuela's earthquake death toll has reached 1,430 with the US Geological Survey warning fatalities could top 10,000, placing it among Latin America's deadliest in a century. US military planes are landing in Caracas, Washington is mobilising $150 million in aid, and rescue teams from 17 countries are on the ground.
