At Cornell University in upstate New York, researchers are testing how a deep geothermal system can work far from the tectonic boundaries and volcanoes that have long defined where the energy  is viable.   By tapping into the planet's internal warmth, the project, known as Earth Source Heat , could supply the 2,300-acre (931-hectare) campus in Ithaca with fossil fuel-free heat to help the university become carbon neutral by 2035.   "We are developing the tools to do geothermal where the people