The climate of the Sahara has undergone enormous variations between wet and dry over the last few hundred thousand years.

Evolution in response to abiotic factors, such as climate change, is not coevolution (since climate is not alive and does not undergo biological evolution).

The story emerging from the ice cores is that in the past, at least, the climate has undergone wide temperature changes during both ice ages and interglacial periods.

However, the climate has undergone a drastic change in the past few years, with the mercury rising and the rainfall decreasing each year.

All ocean life becomes extinct and the earth's climate undergoes dramatic, yet positive, change.

The political climate in Japan was also undergoing changes during this time.

"The whole climate has undergone quite a change," said the organizer, Omer Madra.

From that point on, the climate in law enforcement underwent a shift, and the image of Dirty Harry was replaced by at least the appearance of restraint.

Studies of lineated valley fill have added evidence that the climate of Mars has undergone many large changes in the past.

Overall, two things are currently happening worldwide: (1) temperature is increasing on the average; and (2) regional climates have been undergoing noticeable changes.