This page contains polls dedicated to How do we know that the climate has changed?.
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In more recent times, geologists and palaeontologists have been able to make more accurate measurements of the age of ancient rocks. Trees produce a new 'ring' every year, and these can be measured and counted. The width of the ring shows how well the tree grew in any year, reflecting climatic conditions at that time.

The rings of even partly fossilized trees buried in bogs can be measured, and these measurements provide accurate records of climate changes over the past 750,000 years. By mea read more...

Tags: weather, fossils

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