Study Material | Test Series | Crash Course
Drishti IAS
call1800-121-6260 / 011-47532596
Drishti The Vision Foundation
(A unit of VDK Eduventures Pvt. Ltd.)
Current Affairs Crash Course Download Player Download Android App
Greenhouse Gas Levels Hit New High
Dec 31, 2014

A new report shows Greenhouse gas pollution in the planet’s atmosphere reached record-high levels last year. The surge was largely driven by carbon dioxide, levels of which increased more between 2012 and 2013 than during any other year in the past three decades.

In 2013, concentrations of CO2 in the atmosphere were 142 percent higher than pre-industrial levels. For methane and nitrous oxide, two other potent greenhouse gases, concentrations hit about 250 percent and 120 percent above 1750-era levels, respectively, according to data released recently by the United Nations’ meteorological advisory body.

Partly blamed are human activities such as the burning of fossil fuels. As the world’s economies continue to depend on coal, oil and natural gas for electricity and transportation, more heat-trapping emissions are spewing into the atmosphere.

We know without any doubt that our climate is changing and our weather is becoming more extreme as a result. But the scientists said the new data reveal a potentially more disturbing development with CO2 levels in particular.

Normally when CO2 is emitted, about half of it is absorbed by both the oceans and the biosphere (all of the world’s ecosystems put together). The other half stays in the atmosphere, building up and helping to cause global warming. The report suggests that in 2013, the biosphere absorbed less CO2 than usual, which in turn created higher levels of CO2 in the atmosphere.

If the oceans and the biosphere cannot absorb as much carbon, the effect on the atmosphere could be much worse.It could be that the biosphere is at its limit.

The annual report, called the Greenhouse Gas Bulletin, for the first time included data on the effects of CO2 in the oceans. The higher concentrations are causing ocean acidification, a process that alters marine ecosystems and damages coral reefs. Scientists said current rates of acidification are “unprecedented at least over the last 300 million years.

Past, present and future CO2 emissions will have a cumulative impact on both global warming and ocean acidification. The laws of physics are non-negotiable.”

A separate UN report  said that significant reductions in Greenhouse gas emissions will be needed by 2050 to avoid the worst possible effects of global warming, which is already being felt on all continents.


Helpline Number : 87501 87501
To Subscribe Newsletter and Get Updates.

http://www.drishtiias.com/upsc-current-affairs-article-Greenhouse-Gas-Levels-Hit-New-High