ScienceDaily: At times in the distant past, an abrupt change in climate has been associated with a shift of seasonal monsoons to the south, a new study concludes, causing more rain to fall over the oceans than in the Earth’s tropical regions, and leading to a dramatic drop in global vegetation growth. If similar changes were to happen to the Earth’s climate today as a result of global warming — as scientists believe is possible – this might lead to drier tropics, more wildfires and declines in …