Frank said (that) they had had an ecology class yesterday. They had discussed different enviromental problems.
Chris said (that) they were the most important problems these days.
Frank said (that) he thought many people understood they should have protected the environment.
Chris asked (that) if they really undestood that and said (that) he wasn't quite sure, because factories dumped waste into rivers, air polution was getting worse too.
Frank said (that) that was true. And yet more and more people fought against nuclear tests, nuclear weapons and other things.
Chris asked if they would win and when would they win these battles?
Frank said not to lose hope and let's hope for the best.