Molotov cocktails are flying and live rounds have been fired. Once-peaceful pro-democracy demonstrations are transforming into violent confrontations—and neither side seems willing to back down. The agricultural revolution that has swept much of the world has still not reached much of Africa; we look into the seeds of the problem. And why Colombia has a growing difficulty with a druglord’s hippos.For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/radiooffer For information regarding your data privacy, visit acast.com/privacy