Based on the information given, it can be deduced that the reliable paleoclimate record was about 800,000 years ago.
Paleoclimatology simply means the study of the climate of the Earth. It's the study of climates where direct measurements were not taken.
It should be noted that the reliable paleoclimate record from the Antarctic and Greenland ice cores provides information back to approximately 800,000 years ago.
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A disadvantage would be..
1. Over harvesting, harvesting soo much soo quickly resulting in the land losing all it's nutrients.
2. Use of Pesticides/Herbicides
It is A. oceans, E. lakes
