ScienceNews: The dramatic expansion of agriculture in India and southeastern China during the 18th century — a sprawl that took place at the expense of forests — triggered a substantial drop in precipitation in those regions, a new study suggests. Winds that blow northeast from the Indian Ocean into southern Asia each summer bring abundant rain to an area that’s home to more than half the world’s population. But those seasonal winds, known as monsoons, brought about 20 percent less rainfall each …