Charts that track CO2 show clearly a rise in levels since the 1950's. This corresponds to post war development, commercial airlines etc. CO2 levels are the highest they have been in 3 million years according ti a cnn report today.
This rapid change is not normal, or natural. The only question is how bad the effects will be to the planet and life.
If it does drive extreme weather events, it could become a sovereign risk to some countries before long due to the high costs of management.