Republican: An international team of scientists is hoping that a core – nearly a fifth of a mile long – drilled out of the bed of an ancient Siberian lake will provide a unique history of climate change over more than 3 million years. The team, which included researchers from University of Massachusetts here, as well as German, Russian and Austrian scientists, returned this month from the six-month drilling expedition to Siberia’s Lake El’gygytgyn, “Lake E” for short. It formed 3.6 million years …