Earth's climate has fluctuated between cold and warm periods for millions of years. During the so-called "lukewarm interglacials"—warm phases between 800,000 and 430,000 years ago—atmospheric CO 2 ...

Tucked away in a laboratory at the University of Exeter in the UK, Rebecca Koll is setting conifer trees alight in the hope of answering burning questions about the future of forest fires. Wildfires ...