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UN '95% sure' humans cause warming

Source BBC News@ tienganhvui.com




Live: IPCC delivers climate change report



On the ground, in the air, in the oceans, global warming is "unequivocal", according to a landmark report on the Earth's climate.


The report by the UN's climate panel details the physical evidence behind climate change.


Scientists are 95% certain that humans have been the "dominant cause" of the rise in temperatures since the 1950s.


They say that a pause in warming over the past 15 years is too short to reflect long term trends.


The panel warns that continued emissions of greenhouse gases will cause further warming and changes in all aspects of the climate system.


To contain these changes will require "substantial and sustained reductions of greenhouse gas emissions".


After a week of intense negotiations in the Swedish capital, the summary for policymakers on the physical science of global warming has finally been released.


The first part of an IPCC trilogy, due over the next 12 months, this dense, 36-page document is considered the most comprehensive statement on our understanding of the mechanics of a warming planet.


It states baldly that, since the 1950s, many of the observed changes in the climate system are "unprecedented over decades to millennia".


Each of the last three decades has been successively warmer at the Earth's surface than any preceding decade since 1850.


"Our assessment of the science finds that the atmosphere and ocean have warmed, the amount of snow and ice has diminished, the global mean sea level has risen and that concentrations of greenhouse gases have increased," said Qin Dahe, co-chair of IPCC working group one, who produced the report.





Đăng ký: Tieng Anh Vui

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