Many of the top Democratic presidential candidates took part in a seven-hour climate change forum Wednesday, but they’re not done talking about it on a nationally televised stage. Although the Democratic National Committee decided against hosting a single-issue debate about climate change, the issue — which is one of voters’ top concerns — will be the subject of another independent town hall in roughly two weeks. Wednesday’s summit was hosted by CNN; on September 19 and 20, MSNBC will air its own climate town hall beginning at 3 pm ET each day. The event, which is cosponsored by the Georgetown...