Arabica beans, responsible for 70 percent of the world's coffee market, could face extinction due to climate change, researchers at Britain's Kew Gardens say.Rising tides and warming temperatures worldwide could render 99.7 percent of popular current bean-growing regions unsuitable for raising coffee, possibly causing the world's predominant coffee crop to be extinct by 2080, the researchers said.Wild Arabica grows naturally in the mountains of Ethiopia and South Sudan, and while most commercial coffee is reproduced by farming and in greenhouses, the wild strain is vital as a source.......