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Apr 8, 2020 ... Dr Lombardo said: "Archaeologists, geographers, and biologists have argued for many years that southwestern Amazonia was a probable centre of ... For thousands of years, humans have modified the physical environment by ... built, less water flows downstream. This impacts the communities and ... ... thousands of years, had developed resistance to many of these tropical germs. And these cattle might also explain why tropical Africans had not succumbed to ... Mar 26, 2025 ... Emissions per person have decreased slightly in the last few years. ... A few weeks to thousands of years, Varies (the highest is sulfur ... WHO creates first system for surveillance. During the seasonal flu epidemic of 1947, small changes in the composition of influenza viruses had made existing ... Jul 22, 2020 ... ... thousands of years. But, the research, also shows that they must have come by sea, rather than across a land bridge. According to Professor ... Dec 7, 2023 ... Honest question, with no agenda – if man only started messing with the atmosphere on a grand scale only 250 years ago, and before that for the ... May 16, 2024 ... Deforestation in Europe dates back at least 10,000 years to a time when early farmers swept across the continent, felling forests and creating ... No. Even if emissions of greenhouse gases were to suddenly stop, Earth's surface temperature would require thousands of years to cool and return to the level ... Over thousands of years, these materials were improved ... Settling and movement over almost 2,000 years, along with occasional earthquakes, have created ...