Many people say, “Climate has always changed.” That’s correct.

Earth’s orbit changes over tens of thousands of years. Solar radiation fluctuates. Volcanoes inject aerosols into the atmosphere. These drivers explain ice ages and past warm periods.

But today’s situation has three key differences:

1. Speed. Global average temperature has risen about 1.2°C since the late 19th century. That rate is extremely fast compared to most natural transitions.
2. CO2 concentration. We moved from \~280 ppm to over 420 ppm in about 150 years.
3. Carbon signature. The isotopic fingerprint of atmospheric carbon matches fossil fuel sources.

Climate models confirm this. Without human emissions, recent warming does not appear in simulations. With human emissions included, the models align closely with observations.

Natural variability still exists. It influences year-to-year fluctuations. But the long-term trend is driven by us.

Understanding this distinction matters. If humans drive the change, humans can reverse it.

We turn climate change around.

Visit [ReduceCO2Now.com](http://ReduceCO2Now.com) or join [https://discord.gg/XbC4r6GCvf](https://discord.gg/XbC4r6GCvf)

\#ReduceCO2Now #ClimateData #CO2 #ScienceBased #ClimateDiscussion

Natural Variability vs Human Emissions: Why Both Matter, But One Dominates Today