Posts Tagged With: climate change

Food For Thought: Global warming is a natural phenomenon – look at the ice ages. Where is the evidence that human impact plays a part?

global-warming

  Global warming is a natural phenomenon – look at the ice ages. Where is the evidence that human impact plays a part?  

Answer:

” Global temperatures have varied in step with carbon concentrations in the atmosphere, and these concentrations have suddenly shot up way above anything experienced over the past half million years. Human activity is the only explanation for this sudden surge.

Climate scientists talk about temperature, greenhouse gas concentrations and emissions. To understand what they are saying you must be prepared to study figures, think bout probability and allow for scientific complexity being reduced to media simplicities.

First: temperature. There is broad consensus that global temperatures should not be allowed to rise more than 2 C above pre-industrial levels, although Professor Rajendra Pauchauri, head of the International Panel on Climate Change (IPCC) with its 2500 climate scientists, now says that 1.5 C would be more appropriate. Land-based temperatures have already risen 0.8 C, and current levels of emissions in the atmosphere commit us to a rise of 1.3 C due to the time lag between cause and effect. The biggest danger is runaway global warming. For example, if the area of arctic ice reduces there is more dark water to absorb heat from the Sun. This, in turn, causes more ice to melt – exposing more dark water – causing more melt – more dark water – more melt. This is a chain reaction that could cause temperature to rise without any further help from us.

Second: greenhouse gas concentrations. The Stern Review (2006) stated that greenhouse gas concentrations at the time it was written were at 430ppm CO2e (parts per million of carbon dioxide equivalent). A figure of 382ppm is sometimes mentioned but this does not include methane (CH4) and nitrous oxide (N2O). Before the industrial revolution the figure was 280ppm. According to the Stern Review, “stabilisation at 450ppmCO2e is almost out of reach, given that we are likely to reach this level in ten years”. It therefore set a target for stabilising at 550ppmCO2e.

Third: Emissions. Despite the Kyoto Protocol (adopted in 1997), emissions have been rising at an ever-increasing rate. In 2006 James Hansen, who heads the US NASA Goddard Institute for Space Studies, said: “A global tipping point will be reached in ten years if levels of greenhouse gases are not reduced. Global warming at this point becomes unstoppable.” The prestigious Tyndall Centre for Climate Change, in a 2006 report ‘Living Within a Carbon budget’, said that a 90 percent cut in UK greenhouse gas emissions, including those from shipping and airlines, is needed by 2050, adding that emissions must reduce by “an unprecedented nine per cent a year from 2010 for up to 20 years”. With this sort of reduction oil refineries would no longer be viable, so we would be moving to a carbon-free economy.

What about sea levels? Greenland is the size of France and Spain combined and mostly covered with ice two kilometres (km) deep. Melt-water is dropping down crevasses and lubricating the base so that glaciers are sliding into the sea faster than anticipated. It was predicted that Greenland would lose 80km3 of ice in 2006. NASA’s Grace satellite showed that it actually oat 287km3 that year.If greenhouse gas emissions are not stabilised within a decade, sea levels could rise several metres before the end of this century.”

Alastair Sawday (2008: 11-12) What About China?

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People of Earth, any last wishes before mission Oblivion?

No, this isn’t the prequel of cruise’s latest sci fi “Oblivion”, although the movie does leave many crucial Environmental messages to the audiences, for those who have already watched the movie will know what I’m referring to.

Unlike other previous greedy civilizations which raced to territorial expansion and other personal gains, this is the first civilization ever whose mission for more and more economic growth is on the verge of destroying planet earth.

I’ve discovered something new recently, a kind of knowledge that was already there for many years and global warming scientists are well aware of it but unfortunately this is the first time that it has come to my attention. Unless you are a science freak or someone who has read a lot about global warming in general might probably have heard or read somewhere that CO2 (Carbon dioxide concentration) levels have almost reached the mark of 400 ppm (parts per million).

Your question would most probably be what is ppm? Now I know most of you out there aren’t into chemistry or physics, as you can see I myself am not able to remember if CO2 was taught to me during chemistry classes or physics, most probably chemistry I think, please correct me if I’m wrong, either way it doesn’t really matter at this moment of time. I’ll make it easier for you to understand in a simple way, according to  Joe Romm’s blog post on thinkprogress.org/climate which is based on a research done by Jonathan G. Koomey

4koomey

CO2 levels for the past 12,000 years (a study done via Koomey)

It’s interesting to know that for approximately 12,000 years the CO2 concentration was at a static unchanged level of around 250-300 ppm (parts per million), but whats frightening is the fact that since the start of the 20th century (1900) it started going beyond 300 ppm and constantly increasing to the current level of approximately 400 ppm.

This technically means that for the first time in human history a 100 ppm has increased in only a century.

It is important to bring to everyone’s attention that this is not another movie on Global warming, or my attempt to include this post in the latest issue of National geographic or time magazine, no my fellow readers, this my dear friends is A REAL FACT which requires A REAL SOLUTION in order to avoid A REAL AND SAD TRAGEDY.

I rest my case 😐

Categories: Global Warming | Tags: , , , , , , , , , | Leave a comment

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