The Hidden Start of Climate Change

The impact of human activity on global warming was noticeable much earlier than previously understood. This revelation challenges the common belief that the effects of climate change became apparent only in the 20th century. It turns out that the signs were there much earlier, even before the widespread use of cars. The discovery came from a team of climate experts who used a mix of scientific methods and advanced computer models. They found that by 1885, the human footprint on climate change was already detectable in the Earth's atmosphere. This was a time when the industrial revolution was in full swing, but gas-powered cars were not yet common. The focus of this study was on the stratosphere, the second layer of the atmosphere. Unlike the troposphere, where most weather occurs, the stratosphere cools down due to greenhouse gas emissions. This cooling effect was the key to identifying the early signs of human-caused climate change. The researchers were surprised by their findings. They had not expected to find such clear evidence of human impact so early in the climate record. The signal of climate change was detectable after just a small increase in carbon dioxide levels between 1860 and 1899. This is a stark contrast to the rapid increase in carbon dioxide levels seen in recent decades. The study highlights the importance of monitoring the upper atmosphere. It shows that changes in the stratosphere can serve as early indicators of climate change. This is crucial for understanding the effectiveness of climate mitigation efforts. However, there is a concern. Budget cuts are threatening crucial climate monitoring programs. This could make it harder to track changes in the atmosphere and understand the impact of human activities on the climate. It is essential to continue these observations to stay informed and safe.