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- W137374087 abstract "CURRENT SCIENCE, VOL. 104, NO. 11, 10 JUNE 2013 1472 tropical-like moist and hot conditions prevailed in the polar regions and inland seas flooded vast areas of the continents. Unlike today, this and similar past hothouses were accompanied by CO2 buildup rates that were much smaller than what we are witnessing now. The current 100 ppm increase in the last century would have taken tens of thousands of years then. What is the concern now? In December 2009 at Copenhagen, world governments agreed to limit global warming to 2°C above the preindustrial period. If climate change is to be stabilized at 2°C above preindustrial level – models tell us – CO2 concentration cannot exceed 450 ppm. Reaching the symbolic milestone of 400 ppm is just another grim reminder about how fast we are approaching 450 ppm. At the current rate of CO2 emissions, we could reach the 450 ppm target as early as 2035. It should not be surprising if we reach the target earlier than this date given the accelerating emissions in recent years. Why is the target focused on CO2 while there are other climate warming agents like black carbon or methane? The trouble with CO2 is that it has a long lifetime in the atmosphere. While black carbon has a lifetime of 2 weeks and methane about 10 years, CO2 is estimated to have a lifetime of about 100– 300 years. This refers to the time for CO2 to get into the deep ocean where it is permanently sheltered from the atmosphere. But the climate system is too complex and the deep ocean does exchange its water with the surface ocean on thousands of years timescale. Recent studies show that about 10–25% of emitted CO2 will be still around in the atmosphere even after 10,000 years. Therefore, large emissions could take the planet back to one of those hot-house conditions that prevailed in the geologic past when global mean temperatures were 5–10°C warmer than today. Sea levels in such a hot-house world with ice-free poles will be higher by 120 m. This should worry anyone who is concerned about the longterm habitability and fate of human civilization on this planet." @default.
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- W137374087 date "2013-06-01" @default.
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- W137374087 title "Conserving the endangered Mahseers (Tor spp.) of India: the positive role of recreational fisheries." @default.
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