MetroWest Daily News: One degree Fahrenheit might not sound like a lot, but picture the amount of energy required to raise the temperature of a cup of water that amount. Multiply that for a swimming pool. Do so again for a planet, say Earth. For biology and environmental studies professor Dan Perlman of Brandeis University in Waltham, that’s the import of a new report citing the past decade as the globe’s warmest on record, by nearly one degree. “That, along with all the other evidence, continues to …