The problem isn't even about wether Climate Change exists but about the cause of it, some people (not just Trumpists in USA) are so anti-science they still bring up the sun as main cause even tho scientific data indicates since decades the planet would traject towards another ice age (in a way slower tempo than the opposite that we have caused) if we weren't emitting ridiculous amounts of carbondioxid and other gases into the stratosphere, or they bring up average temperature increases in pre-historic times even tho our planet hasn't seen such drastic changes in global temperatures and climate for a continued time and in this fast tempo (the asteroid impact that extincted almost all dinosaurs except birds caused a few impact winters), the climate change after huge volcanic eruptions, which created the syberian traps went through 100.000+ years to kill almost all non-microbe life on earth.
This climate change happens so damn fast and even faster than predicted by scientists that not only animal life, but us humans have too much trouble to adapt fast enough, this is the actual biggest danger and not that climate change happens, that indeed happened throughout the existence of this planet we call earth.