History of global warming
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Early Scientific Foundations of Global Warming
The history of global warming science stretches back nearly 200 years, beginning with early investigations into the Earth's energy balance and the role of greenhouse gases. Pioneers like Svante Arrhenius and Guy Stewart Callendar developed mathematical models in the late 19th and early 20th centuries, quantifying how carbon dioxide (CO2) could warm the planet. Their calculations, based on the physics of radiative transfer, provided a robust foundation for understanding how human activities could influence global temperatures Anderson2016Yong2012.
Emergence of Warming Trends and Instrumental Records
Instrumental temperature records and proxy data show that global temperatures remained relatively stable from 1700 to the early 1860s. Industrial-era warming began in the mid-1860s, with both ocean and land temperatures rising. Notably, land temperatures started increasing at nearly twice the rate of ocean temperatures in the late 20th century. By 2020, global warming had already exceeded 1.5°C above pre-industrial levels, a figure higher than many previous estimates McCulloch2024Ameur2022.
The Early Twentieth Century Warming (ETCW)
The first half of the 20th century saw a pronounced warming period, known as the Early Twentieth Century Warming (ETCW), from about 1901 to 1950. This warming was driven by a mix of increasing greenhouse gases, natural factors, and internal climate variability. Regional anomalies, such as Arctic warming in the 1920s and 1930s, were especially notable. The ETCW also coincided with significant climate events, including droughts and heatwaves in North America and Australia Hegerl2018Delworth2000.
Acceleration and Public Awareness in the Late 20th Century
After a mid-century slowdown, global temperatures began to rise again in the late 1970s. By the 1980s, climate scientists predicted that unprecedented global warming would become apparent around the year 2000. Public awareness surged in 1988, when a record-hot summer and testimony by scientist James Hansen before the U.S. Congress brought the issue to the forefront. That same year, the Intergovernmental Panel on Climate Change (IPCC) was established to assess and report on the science of global warming Weart2017Change2004.
Recent Warming in Historical Context
Reconstruction of global temperatures over the past 11,000 years shows that the recent warming is exceptional. While the early Holocene was warm, the planet cooled over the next 5,000 years, reaching a low point during the Little Ice Age about 200 years ago. Since then, temperatures have risen rapidly, making the current global average warmer than during 90% of the Holocene. Projections indicate that, under current greenhouse gas emission scenarios, future warming will exceed any period in the past 11,300 years .
The Anthropocene and Societal Implications
The scale and speed of recent global warming have led scholars to describe our era as the Anthropocene—a new epoch defined by significant human impact on the Earth's systems. This shift challenges traditional ways of understanding history and requires a broader, species-level perspective to grasp the unprecedented magnitude and risks of global warming .
Conclusion
The history of global warming is a story of scientific discovery, growing evidence, and increasing urgency. From early theoretical work to modern climate models and international policy responses, the understanding of global warming has evolved into one of the most important scientific and societal challenges of our time. The evidence shows that recent warming is both exceptional in the context of Earth's history and closely linked to human activities, underscoring the need for informed action and global cooperation Weart2017Change2004Yong2012+6 MORE.
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