How are humans responsible for global warming and ecological imbalance?
Answers
Explanation:
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The case for attributing the recent global warming to human activities rests on
the following undisputed scientific facts:
• Carbon dioxide (CO2) is a greenhouse gas that warms the atmosphere.
• Since pre-industrial times, atmospheric CO2 concentrations have increased from about 280 parts
per million (ppm) to over 380 ppm. Current concentrations of CO2 and other greenhouse gases
are unprecedented in at least the last 650,000 years, based on records from gas bubbles trapped in
polar ice.
• Independent measurements demonstrate that the increased CO2 in the atmosphere comes from
burning fossil fuels and forests. The isotopic composition of carbon from these sources contains a
unique “fingerprint.”
• Since pre-industrial times, global average temperatures have increased by about 0.7ºC, with about
half of the warming occurring over the past few decades.
• The only quantitative and internally consistent explanation for the recent global warming includes
the intensified greenhouse effect caused by the increase in CO2 and other greenhouse gases.
The U.S. National Academy of Sciences—the independent organization of the country’s most renowned
scientists established by Congress to advise the nation on scientific and technical issues—has concluded:
“The scientific understanding of climate change is now sufficiently clear to justify nations taking prompt
action.”
Some argue that the recent global warming is due to natural fluctuations and not to human activities.
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Answer:
The extent of the human contribution to modern global warming is a hotly debated topic in political circles, particularly in the US.
During a recent congressional hearing, Rick Perry, the US energy secretary, remarked that “to stand up and say that 100% of global warming is because of human activity, I think on its face, is just indefensible”.
However, the science on the human contribution to modern warming is quite clear. Humans emissions and activities have caused around 100% of the warming observed since 1950, according to the Intergovernmental Panel on Climate Change’s (IPCC) fifth assessment report.