abu afak
ALLAH SNACKBAR!
- Mar 3, 2006
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Based on Science...Climate Change Humans are Causing Global Warming
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Today’s climate change is driven by human activities.
Scientists know that the warming climate is caused by human activities because:
- They understand how heat-trapping gases like carbon dioxide work in the atmosphere
- They know why those gases are increasing in the atmosphere
- They have ruled out other possible explanations
Natural changes cannot explain today’s global warming.
It is true that Earth has cycled through many ice ages and warm periods in the past. Those past events have been driven by natural changes such as:
- Variations in Earth’s orbit around the Sun
- Solar activity cycles that produce regular shifts in the amount of energy the Sun releases
- Volcanic eruptions that eject dust and gas into the atmosphere, which shade the planet from the Sun’s rays
- Variations in the amount of water vapor in the atmosphere
The rapid warming we are experiencing today can only be explained by increasing amounts of carbon dioxide and other heat-trapping gases in the atmosphere. The link between carbon dioxide in the atmosphere and rising global temperatures has been clear to scientists since the 1850s. Measurements show that there is more carbon dioxide in the atmosphere today than at any other time in the past 1 million years—that is, since the dawn of humankind.
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