Climate activists Just Stop Oil launched a protest at Stonehenge, the 5,000-year-old stone monument in southern England, a day before thousands of people planned to gather there to celebrate the summer solstice. Climate activists Just Stop Oil launched a protest at Stonehenge, the 5,000-year-old stone monument in southern England, a day before thousands of people planned to gather there to celebrate the summer solstice. Environment Phys.org – latest science and technology news stories