Climate is always changing, but luckily, we live in an era with a stable, benign, warm climate and a healthy, abundant biosphere.
Alarmists who claim that today’s climate changes are unprecedented have not checked climate history written in the rocks, the ice cores, the satellite registers and the tide gauges.
Ice core records show that current temperatures and sea levels are not extreme – they are more stable than they were as the last ice age ended just 12,000 years ago. At that time, global temperature increased quickly, the great ice sheets melted, sea levels rose rapidly (130 meters), and the warming seas expelled much of their dissolved carbon dioxide into the atmosphere. As a result of this natural global warming and the additional moisture and carbon dioxide plant food in the atmosphere, plant life recovered, and the great forests and grasslands were re-established.
Check the Ice Core Records:
http://carbon-sense.com/index.php?s=ice+cores&Submit=Go
http://carbon-sense.com/2009/10/03/taxing-ambulances/