Test Preparation on IAS Prelims Sample Paper -35

1.

"Arctic greening" is attributed to which of the following reasons?

Justification and Learning: "Arctic greening" is a term related with the C02 fertilization effect.The carbon fertilization effect suggests that the increase of carbon dioxide in the atmosphereincreases the rate of photosynthesis in plants. The effect varies depending on the plant species,the temperature, and the availability of water and nutrients. From a quarter to half of Earth'svegetated lands has shown significant greening over the last 35 years largely due to rising levelsof atmospheric carbon dioxide. Scientists have been finding, that as northern portions of theplanet (Arctic) warm up even as total atmospheric carbon dioxide increases, there's been anincrease in plant growth in these regions. Studies led by Trevor Keenan from the Department ofEnergy's Lawrence Berkeley National Laboratory (Berkeley Lab) show that, from 2002 to 2014,plants appear to haye gone into overdrive, starting to pull more carbon dioxide out of the air 'than they have done before. The result was that the rate a^which carbon dioxide accumulates inthe atmosphere did not increase during this time period, although previously, it had grownconsiderably in concert with growing greenhouse gas emission
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