If I could go back in time and prevent one major event that contributed to climate change, I would prevent the Industrial Revolution from happening. The Industrial Revolution was the period between the 18th and 19th centuries when new manufacturing processes led to a significant increase in carbon emissions, which greatly accelerated global warming.
If the Industrial Revolution did not occur, the world would be vastly different today. Without the technological advances brought about by the Industrial Revolution, many aspects of modern life, such as transportation, communication, and medicine, would be severely limited. However, without the intense burning of fossil fuels that has occurred since then, the concentration of greenhouse gases in the atmosphere would be much lower today, and we may have been able to avoid some of the worst effects of climate change that we are currently experiencing.
It's important to note that while preventing the Industrial Revolution may not be a practical solution, there are still steps we can take now to mitigate the effects of climate change and prevent further damage to our planet. This includes reducing our reliance on fossil fuels, implementing sustainable energy sources, and reevaluating our consumption patterns.