VOA: Helicopters were crucial in evacuating more than 250,000 people in China’s northeastern Liaoning province days ago. Torrential rains battered the area and led to severe flooding along the border with North Korea. Weather experts and Chinese officials attribute the heavier than usual rainfall to unusual climate patterns and global warming. This was the latest of what has become a summer of natural disasters for China. Official media call it the country’s worst flooding in a decade, …