Climate Climate tweets 7/30/19 Ahead of the @CNN Democratic Presidential Debates this week - check out the top question topics according to almost 50K responses from CNN readers.. 1) Climate Crisis2) Economy 3) Health Care (Impeachment #6) #CNNDebate pic.twitter.com/GR6YKfXpvg— Julia Chatterley (@jchatterleyCNN) July 30, 2019