Nineteen people have been arrested at Yale University in Connecticut for their role in a sit-in calling for Yale to purge its nearly $24 billion endowment from fossil fuel corporations. The students want school officials to reopen the discussion after deciding not to divest in August. Yale’s endowment is the third largest in the country. Students there join a growing number across the country who are demanding divestment from companies that drive global warming. The Massachusetts Institute of Technology hosted a debate on divestment Thursday. Student activists covered the windows of a university building with colored paper spelling out the word “divest.” And Harvard Heat Week begins on Monday. Harvard Heat Week is the divestment efforts of students and professors at Harvard University in Cambridge, Massachusetts.