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Blondie
Geography
6 December, 18:29
Describe the effects of natural climate change
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Maia Robbins
6 December, 18:32
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Climate change is complicated because non-climatic influences dominate local, short-term biological changes. Any underlying signal from climate change is likely to be revealed by analyses that seek systematic trends across diverse species and geographic regions; however, debates within the Intergovernmental Panel on Climate Change (IPCC) reveal several definitions of a 'systematic trend'. Here, we explore these differences, apply diverse analyses to more than 1,700 species, and show that recent biological trends match climate change predictions. Global meta-analyses documented significant range shifts averaging 6.1 km per decade towards the poles (or metres per decade upward), and significant mean advancement of spring events by 2.3 days per decade. We define a diagnostic fingerprint of temporal and spatial 'sign-switching' responses uniquely predicted by twentieth century climate trends. Among appropriate long-term/large-scale/multi-species data sets, this diagnostic fingerprint was found for 279 species. This suite of analyses generates 'very high confidence' (as laid down by the IPCC) that climate change is already affecting living systems.<3 have a blessed day!
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Moses
6 December, 18:54
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Climate change is happening, it is caused in large part by human activity, and it will have many serious and potentially damaging effects in the decades ahead. Greenhouse gas emissions from cars, power plants and other man-made sources-rather than natural variations in climate-are the primary cause. These emissions include carbon dioxide - the main greenhouse gas - which has reached a concentration level in our atmosphere that the Earth hasn't seen for more than 400,000 years. These greenhouse gases act like a blanket, trapping the sun's warmth near the earth's surface, and affecting the planet's climate system.
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