People are protesting against coal.
Old people are protesting.
Not all people who protest against coal are old.
exists e1 x1 x2.(against(e1,x2) & n_coal(x2) & Actor(e1,x1) & v_protest(e1) & n_people(x1))
exists e1 s1 x1.(Actor(e1,x1) & v_protest(e1) & n_people(x1) & a_old(s1) & Theme(s1,x1))