Causes of climate change .. What do scientists say?!


Scientists have identified a turning point in history, and consider it the “critical mass” in the occurrence of climate change, and they define it as the “industrial era” that began in the year 1780 AD, indicating that the industry, despite the potential, energies, progress and prosperity it provides for humanity, its damage to the environment was crucial to climate change.

But unlike the “industrial revolution”, there are other reasons related to nature, which scientists see as having a significant role in the changes that the Earth has undergone in the long term, including:

Changes in the Earth’s rotation

These orbital cycles mean that different amounts of solar radiation are received at each latitude during each season of the year, and there is still debate about how these ice ages begin and end, but there are studies that indicate that the amount of summer sunlight falls on the continents The north plays a vital role. If it drops below a certain degree, the snow from the previous winter does not melt in the summer, and with more snow accumulation, the ice cover begins to grow.

Changes in the intensity of the sun

“NASA” indicates that from the mid-1600s to the early 1700s, the Earth’s surface temperature in the northern hemisphere appears to have reached its lowest, or close to, rate during the last thousand years, and the winter temperature in Europe decreased between 1 to 1.5 degrees.

Volcanic eruptions produce aerosols

Aerosols are small particles in the atmosphere that vary greatly in size, composition, and chemical concentration. Volcanic emissions produce dust particles that block sunlight and can lower the temperature in the short term.

Volcanic eruptions produce carbon dioxide

Volcanoes also emit carbon dioxide, and analysis of geological samples indicates that warm, snow-free periods coincide with elevated levels of carbon dioxide in the atmosphere. The Intergovernmental Panel on Climate Change says that “in a million years, carbon dioxide levels will change as a result of tectonic activity.”

industrial era

After the start of the industrial era around 1750 AD, the average surface temperature of the Earth increased by 0.7 degrees Celsius, and in the twentieth century the temperature increased in two stages, the first: from 1910 AD to 1940 AD (0.35 ° Celsius), and it rose strongly from the seventies to the present by ( 0.55 degrees Celsius), and during the past 25 years, the world has witnessed the 11th highest temperature rise, and the main reason for this is the rise in the proportion of carbon dioxide in the atmosphere, which during the last century in general exceeded 379 parts per million, due to human activities.

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