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Climate change is a fact on any planet with an active molten core and/or a gaseous or aqueous atmosphere. Planet Earth has had huge global warms and ice ages before with temperature swings greater than predicted now.
Humans are burning stuff to increase greenhouse effect but other organisms and volcanoes have done it in the past. With sometimes much more drastic and rapid effect. Nothing new.
Northern Canada used to be a sub-tropical rainforest, theres an ancient forest beneath a kilometre of ice in Antarctica.
Heck look up "The Great Oxygenation Event" sometimes called "The Great Oxygenation Catastrophe" to see a much more drastic spamming of particles into our atmosphere by cyanobacteria. It caused the extinction of most other life on the planet.