Paul Epstein started his career as a physician caring for the poor in Mozambique and Boston. In a new book, the Associate director of Harvard Medical School's Center for Health and Global Environment connects the dots between climate change and its global impacts. They range from cholera outbreaks in Africa and plankton blooms in the Caribbean ... to parasites devastating East Coast oysters.

"The world must invent new ways to protect people driven from their homes by climate change without copying safeguards for those uprooted by wars or persecution, the head of the U.N. refugee agency said on Monday."

As world demand for staples like wheat, rice, corn, and soy outpaces dwindling growth in agricultural production, food prices are rising and more people are hungry. Now experts are saying that climate change is playing a bigger role than they once expected.

"A climate change scientist who has been targeted by death threats says the science community must still continue to release the latest research."

"Some areas in the tropics face famine because of failing food production, an international research group says."

"Earthquake-hit Japan and many other rich nations are reaffirming pledges to give $30 billion from 2010-12 to help poor nations fight climate change despite budget cuts, a Reuters survey showed on Wednesday."

"The record leap in global greenhouse gas emissions last year has thrown the spotlight on the world's only concerted attempt to stem the tide of global warming -- the United Nations climate negotiations."

"Canada’s fabled Northwest Passage will not open up to shipping anytime soon, according to a study that warns global warming is a double-edged sword for northern transportation."

"For Republican presidential contenders who once supported combatting global warming, the race is heating up. Faced with an activist right wing that questions the science linking pollution to changes in the Earth's climate and also disdains big government, most of the GOP contenders have stepped back from their previous positions on global warming."