Reuters: Costa Rican coffee farmers are facing threats from climate change but the rising temperatures are also expanding high-altitude regions where the country’s most prized beans are grown. Human emissions of greenhouse gases could cause the earth’s surface temperature to rise anywhere between one and six degrees Celsius (1.8 and 10.8 degrees Fahrenheit) over the next 100 years, according to the United Nations, forcing growers of all crops to adapt to new weather conditions. In Costa …