They point to the so - called ice ages, when the earth was supposedly much cooler than it is now; and in support of natural warming, they cite evidence that cold regions, such as Greenland, at one time supported vegetation that prefers warm areas.
वे कहते हैं कि एक ज़माने में ग्रीनलैंड में ऐसे पेड़ - पौधे उगते थे, जो सिर्फ गर्म जगहों में पाए जाते हैं यानी एक ज़माने में वह गर्म प्रदेश था ।