3) since a possible increase in the occurrence of extreme weather events (like floods, droughts, heat waves...) is one of the most apprehended feature of climate change and;
(a possible increase in the occurrence of extreme weather events (like floods, droughts, heat waves; is; one of the most apprehended feature of climate change)
a possible increase in the occurrence of extreme weather events (like floods, droughts, heat waves
is
one of the most apprehended feature of climate change