I copy this googling it.
Time scale presents one of the big challenges discussing the science around climate change.
Climate change can take place in the short time frame,say tens of thousands or hundreds of thousands or evan millions of years.Some critics of human-caused global warming raise the objection that earths climate has always changed and that,evan if global temeratures are rising,that`s probably just a result of natural cycles rather than green house gas emissions.Look at the midevil warm period.Look at the litle ice age.And was`nt the earth perty hot when the dinasours were around?So the thinking person wonders:How was the earths temperature thoughout the ages?And do past temperatures compare with what we have today?
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