The map won't reflect current events, but Western Canada, especially British Columbia and Alberta, experienced a heat dome a month ago and one of the towns in BC that broke heat records 3 days in a row subsequently burned to the ground after a stray spark caused by a train passing through (the current theory as to the cause of the fire). I'm talking about temperatures 40C and over.
Much of BC is on fire now, and this is sadly not a new thing. Forest fires and wildfires have been getting worse there over the past several years. The fires are so intense that they create their own weather systems, including lightning storms without any rain. The lightning is causing even more fires.
There are lots of rivers in the red portions of Europe so I'm not sure that flooding is it, unless the map is about the tropical/subtropical regions.
So how to connect all these "partly" answers... The desert regions are white. The tropical and subtropical rainforests are blue.
Deforestation is somewhat related... Deforestation (in this part of Canada) occurs due to logging and to the proliferation of pine beetles munching their way east, from BC to Alberta, and it's been discovered that only prolonged extreme cold will kill them. There have been very bad forest fires in these provinces five years in a row (at least; I wasn't really paying much attention until 2016).
Fewer healthy trees means the ground is less stable, and floods can facilitate landslides that can thoroughly mess up the local environment, especially if there are rivers that are home to migratory fish, like salmon going home to spawn.
(I'm going stream of consciousness here; I know this map isn't about salmon)
One or two, please.