Climate change: Some facts….
{"Image DocumentName": "Climate change: Some facts\u2026.", "Image ImageDescription": "Earth has gone through cycles of warming and cooling in the past. Changes have persisted over decades and sometimes over centuries. Although instrumental measurement of temperature started in 1850, various proxy methods (such as tree rings, ice cores, corals etc.) have been used to understand Paleo-climatology. For example, the Holocene warm period (circa BP), the Roman warm period (circa AD, the medieval warm period (circa AD) and the little ice age (circa AD). It has been shown that there is a 1500-year cycle of global warming.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}