AFRICA'S population is set to nearly double by 2050 - but growth in food production is slowing faster than in any other region of the world as climate change-driven droughts, floods, heat and pests take a toll, African scientists said this week. As rains grow more erratic, the hydropower many African countries depend on to run their economies is becoming unreliable, while coastal communities face worsening erosion, heat, flooding and migration of fish stocks they depend on. But the money African nations need to tackle those threats is largely missing or coming only in the form of loans, while poor governance…