Green Business Talks
The rate of change since the mid-20th century is unprecedented over millennia - NASA
Earth's climate has changed throughout history. Just in the last 800,000 years, there have been eight cycles of ice ages and warmer periods, with the end of the last ice age about 11,700 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives.
Takeaway
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While Earth’s climate has changed throughout its history, the current warming is happening at a rate not seen in the past 10,000 years.
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According to the Intergovernmental Panel on Climate Change (IPCC), "Since systematic scientific assessments began in the 1970s, the influence of human activity on the warming of the climate system has evolved from theory to established fact.
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Scientific information taken from natural sources (such as ice cores, rocks, and tree rings) and from modern equipment (like satellites and instruments) all show the signs of a changing climate.
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From global temperature rise to melting ice sheets, the evidence of a warming planet abounds.
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