climate change and global warming Why its happen

Global temperature rise from 1880 to 2021. Higher-than-normal temperatures are shown in red and lower-than-normal temperatures are shown in blue. Each frame represents global temperature anomalies (changes) averaged over the five years previous to that particular year. Credit: NASA Goddard Space Flight Center/NASA Scientific Visualization Studio/NASA Goddard Institute for Space Studies.
The terms “global warming” and “climate change” are sometimes used interchangeably, but "global warming" is only one aspect of climate change.

“Global warming” refers to the long-term warming of the planet. Global temperature shows a well-documented rise since the early 20th century and most notably since the late 1970s. Worldwide since 1880, the average surface temperature has risen about 1 °C (about 2 °F), relative to the mid-20th century baseline (of 1951-1980). This is on top of about an additional 0.15 °C of warming from between 1750 and 1880.

“Climate change” encompasses global warming, but refers to the broader range of changes that are happening to our planet. These include rising sea levels; shrinking mountain glaciers; accelerating ice melt in Greenland, Antarctica and the Arctic; and shifts in flower/plant blooming times. These are all consequences of warming, which is caused mainly by people burning fossil fuels and putting out heat-trapping gases into the air.

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The planet has experienced climate change before: the Earth’s average temperature has fluctuated throughout the planet’s 4.54 billion-year history. The planet has experienced long cold periods ("ice ages") and warm periods ("interglacials") on 100,000-year cycles for at least the last million years.

Previous warming episodes were triggered by small increases in how much sunlight reached Earth’s surface and then amplified by large releases of carbon dioxide from the oceans as they warmed (like the fizz escaping from a warm soda).
Today’s global warming is overwhelmingly due to the increase in heat-trapping gases that humans are adding to the atmosphere by burning fossil fuels. In fact, over the last five decades, natural factors (solar forcing and volcanoes) would actually have led to a slight cooling of Earth’s surface temperature.

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

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