Facts About Global Climate Change

Over the past 100 years there has been an increase in global average temperature of more than one degree Fahrenheit (0.6°C).

While a global average temperature change of one degree F may seem small, consider that at the height of the last ice age, the earth was only 7 degrees cooler than it is now, and that was 18,000 years ago. So a one degree temperature change in only 100 years is extremely fast in a geological timeframe.

If nothing is done to slow heat-trapping gas emissions and they continue to grow at their present rate of about 1% per year—atmospheric CO2 concentrations will likely be more than 700ppm by the year 2100, and they will still be rising.

State-of-the-art global climate models project that human-caused emissions driving this CO2 rise will result in a significant increase in global average temperatures over the next 100 years, an increase ranging from 2.5° and 10.4°F

Present concentrations of CO2 and CH4 are higher now than at any time during the last 800,000 years—the period for which there are reliable ice core data—and probably significantly longer.

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