"Earth in Transition: The Story of a Changing Climate"

THE TURNING POINT

Swapna Kumbar , Bengaluru - No single person decided to change the climate. No government voted on it. No treaty was signed authorizing it. No scientist drew up a plan and said yes, let us alter the atmospheric composition of an entire planet. It happened incrementally, invisibly, and almost entirely as a side effect of something else: the human desire for warmth, light, speed, and productivity. The Industrial Revolution that extraordinary explosion of machine power, factory production, and fossil fuel combustion that began in Britain in the late 1700s and swept the world over the following two centuries was the greatest leap in human material prosperity in history. It lifted billions out of poverty, extended lifespans, connected continents,  and produced the modern world.It also, without anyone fully intending it, set in motion the most consequential alteration of Earth's atmosphere in at least 3 million years. This is the story of the before and after.

The Before: A Climate That Held Steady for Millennia

Before industrialization, Earth's climate stayed steady for millennia amid natural fluctuations like droughts, volcanic winters, and the Little Ice Age's end (1300–1850 CE), with CO₂ stable at 260–280 ppm thanks to the balanced carbon cycle: plants absorbed it via photosynthesis, releasing it through decomposition, oceans exchanged it, volcanoes emitted it, offset by rock weathering over millennia in a self regulating loop. Pre industrial humans fit within this agriculture cleared forests and diverted rivers with local effects, but modest carbon releases were naturally buffered. Energy relied on muscle (human/animal), wind, and wood: windmills in Netherlands/Persia, waterwheels in Europe/China, sailing ships, wood fires for heat/cooking/iron smelting, and draft animals for fields and transport all limited by real-time solar capture through plants, running civilization on current solar income (recent-tree carbon from wood, none from wind/water), which was climatically safe. By 1750, pre Industrial Revolution: CO₂ ~280 ppm, temperatures at modern baseline, stable extensive Arctic summer sea ice, advancing glaciers, sea levels steady (cm-scale centuries variation), predictable monsoons for Asian farming not flawless (famines/droughts/floods happened), but variations within a stable envelope, not a rewrite.

The After: What Industrialization Has Done to the Climate

The post-World War II period brought what historians and Earth system scientists call the Great Acceleration an unprecedented simultaneous surge in virtually every measure of human activity and its environmental impact. Between 1950 and 2000, global population doubled. Economic output grew fivefold. Energy use tripled. Fertilizer use increased eightfold. Motor vehicle numbers increased ninefold. International tourism grew thirtyfold. These were not unrelated trends they were all interconnected expressions of an industrial civilization running on cheap fossil fuel energy.

What 1.2°C Actually Means and what it represents

The global average temperature today sits approximately 1.2°C above the pre industrial baseline the climate of 1750. The extra heat trapped by the atmosphere every single day is equivalent to detonating approximately 400,000 Hiroshima scale atomic bombs  that is how much additional energy the enhanced greenhouse effect is adding to Earth's climate system daily. Global glacier mass loss is now occurring at a rate that has no precedent in the 10,000 year record. The probability of extreme heat events that would have occurred once per 50 years in the pre industrial climate has increased roughly fivefold they now occur roughly once per decade. Many coral reef systems have already experienced more heat stress than they can sustainably recover from.

And we are still only at 1.2°C. The emissions already in the atmosphere have committed us to further warming even if all emissions stopped today. The question is not whether we will warm further we will. The question is whether we stop at 1.5°C, 2°C, 3°C, or beyond.