Climate change là gì


Today’s global warming is overwhelmingly due to lớn the increase in heat-trapping gases that humans are adding lớn the atmosphere by burning fossil fuels. In fact, over the last five decades, natural factors (solar forcing & volcanoes) would actually have sầu led to lớn a slight cooling of Earth’s surface temperature.

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Global warming is also different from past warming in its rate. The current increase in global average temperature appears khổng lồ be occurring much faster than at any point since modern civilization and agriculture developed in the past 11,000 years or so—và probably faster than any interglacial warm periods over the last million years.


New understanding required new terms

Regardless of whether you say that change is all the side effects of global warming, or that global warming is one symptom of human-caused change, you’re essentially talking about the same basic phenomenon: the build up of excess heat energy in the Earth system. So why vị we have two ways of describing what is basically the same thing?

According lớn historian Spencer Weart, the use of more than one term to lớn describe different aspects of the same phenomenon tracks the progress of scientists’ understanding of the problem.

As far baông xã as the late 1800s, scientists were hypothesizing that industrialization, driven by the burning of fossil fuels for energy, had the potential to modify the For many decades, though, they weren’t sure whether cooling (due to reflection of sunlight from pollution) or warming (due to lớn greenhouse gases) would dominate.

By the mid-1970s, however, more và more evidence suggested warming would dominate and that it would be unlike any previous, naturally triggered warming episode. The phrase “global warming” emerged to lớn describe that scientific consensus.

But over subsequent decades, scientists became more aware that global warming was not the only impact of excess heat absorbed by greenhouse gases. Other changes—sea màn chơi rise, intensification of the water cycle, bức xúc on plants & animals—were likely lớn be far more important khổng lồ our daily lives and economies. By the 1990s, scientists increasingly used “human-caused change” to describe the challenge facing the planet.

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The bottom line

Today’s global warming is an unprecedented type of change, và it is driving a cascade of side effects in our system. It’s these side effects, such as changes in sea level along heavily populated coastlines & the worldwide retreat of mountain glaciers that millions of people depkết thúc on for drinking water and agriculture, that are likely to lớn have a much greater impact on society than temperature change alone.


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