Global Warming In North America

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to other regions during the last century, and in part to capture the attention of North Americans who need to take action now to reduce greenhouse gas emissions.

EVIDENCE

Scientist by far and large accept that Earth�s climate is changing because of the amount of so-called greenhouse gases humans are pouring into the atmosphere. Most of those gases come from fossil fuels, particularly carbon dioxide, or CO2.

And much of the scientific community thinks these gases are causing unnatural climatic warming that could have unimaginable effects on life.

The consensus agrees that Earth has warmed by 1 degree Fahrenheit over the last century. That doesn�t sound like much, but consider that during the last ice age Earth was just 5 to 9 degrees cooler.

And what may be most dramatic in the short run is the idea that changes in climate may also be leading to more severe weather.

THEORY, FACT AND EVIDENCE

In July 1997, President Bill Clinton launched a global warming ...

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