I'm fascinated at how much more we (at least the public) are discovering of the effects of climate change.
Basic level was: hotter years, and then we discover new mechanics that comes with this change
The good news there is that we have a 77% effective malaria vaccine and a number of promising candidate Lyme vaccines - it may turn out that a great many insect-borne diseases can be prevented with vaccination once they start affecting people in rich countries.