Climate change must be stopped? But why?

Natural cyclic changes are a part of Earth's history. These natural cyclic changes have caused what are called m extinctions based on the speed of change and how animals are adapted to living in those changing conditions. Currently humans are burning fossil fuels emitting more heat trapping gases into the atmosphere making climate change that is not natural. In order to allow the planet to continue it's natural cyclic change unimpeded we have to stop emitting gases that would not be in the atmosphere naturally as they were taken out of that natural cycle eons ago. Creatures are adapted to living in current environmental conditions. If you change those conditions dramatically, if they are not adapted to live in those new conditions. they will perish.