Carbon dioxide from human activities increased more than 250 times faster than it did from natural sources during the last Ice Age. Increases in global temperature are one observable sign of rapid climate change.
There is conclusive scientific evidence that the climate system is warming. The Earth's temperature responds to variations in greenhouse gas concentrations, as evidenced by ice cores taken from tropical mountain glaciers, Antarctica, and Greenland.
Fossil fuels, which include coal, oil, and gas, are by far the biggest cause of climate change, contributing more than 75% of all greenhouse gas emissions and almost 90% of all carbon dioxide emissions.
Numerous human activities such as overpopulation, pollution, the burning of fossil fuels, and deforestation have an adverse effect on the physical environment. Climate change, soil erosion, poor air quality, and undrinkable water have all been brought on by changes like these.
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