Monday, November 3, 2014
Pollution of Barcelona, in an intense episode last year.
only way to stop foreseeable ruinous and irreversible effects of climate change is reduced drastically and quickly gas emissions linked to the fossil fuels up to its almost total prohibition in 2100, highlight the Conclusions of the fifth report of the Intergovernmental Panel on Climate Change UN (IPCC), presented yesterday at Copenhagen . The volume, the largest effort to date on climate science, because it has involved 800 authors and analyzed 30,000 scientific articles, aims to inform policy by the end of next year will meet in Paris to try to pass a new global treaty on reducing emissions
To convince the doubters, the text strikes several times in one key respect. undertake a ‘ambitious’ reduction of gas emissions vary the global economic growth during the twenty-first century, estimated between 1.6% and 3% annually, only 0.06 percentage points. “It is technically possible. What are missing are appropriate policies and institutions “, said in a statement Youba Sokona co-chair of one of the working groups of the IPCC. The report is a synthesis of three previous volumes published over the last year.
STRENGTH AND SPEED
To limit the temperature rise at the end of the century two degrees pre-industrial levels, symbolically considered the threshold that separates the acceptable from the catastrophic emissions cuts of 40% to 70% by 2050. If the target is needed is achieved but at a later date, insists IPCC, the problems will be much higher. “The risk of abrupt or irreversible change if it does increase the magnitude of warming,” warns the text. Developing countries, which are precisely the ultimate responsibility of the problem, are the most vulnerable to climate change because of the difficulties they have and will have to face, continues the report, which is key a commitment to “equality” is say, is essential in adapting international investment.
The IPCC report reiterates the familiar warnings that none of the major powers seem to be taken seriously. So, remember that atmospheric concentrations of CO2, the main greenhouse gas, are the highest in the last 800,000 years. And that the period 1983-2012 was probably the 30 warmest years of the past 1400 years . And that sea level has risen 19 centimeters since 1901. “Science has spoken. There is no ambiguity in his message. Leaders must act. Time is not on our side, “said the secretary general of the UN, Ban Ki-moon .
The first IPCC report, published in 1990, 1992 and 1995, still retained many uncertainties are the causes of climate change and its possible evolution, but the fourth, which was adopted in 2007, it was already clear on the attribution of the problem to human activities.
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