Tag Archives: Emissions

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28 February 2018, Nature Climate Change Letters, Biomass-based negative emissions difficult to reconcile with planetary boundaries. Under the Paris Agreement, 195 nations have committed to holding the increase in the global average temperature to well below 2 °C above pre-industrial levels and to strive to limit the … Continue reading →

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13 February 2018, Under the Paris Agreement, governments worldwide agreed to hold global warming “well below 2C” and to aim for 1.5C. The inclusion of that second, tougher, goal was a victory for small island states and other countries on the front line of climate change. It was an acknowledgement of fears that higher temperature rise posed an unacceptable threat to their futures. But the vast bulk of research and analysis prior to 2015 centred on the 2C threshold, a more established international target. What would it take to bend the curve to 1.5C? Enter the Intergovernmental Panel on Climate Change (IPCC). The climate science body agreed to produce a special report on 1.5C, summarising all the available evidence. Climate Home News has obtained an early version of the five-chapter report, which is due to be finalised in September. The IPCC stressed it was a work in progress and may change substantially. It is open for review by experts and governments, and may incorporate further studies published by 15 May. Read the draft summary for policymakers in full here. What is clear from the content so far, though, is there is not much time left. Here are the main takeaways. Read More here

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6 February 2018, Climate News Network, Ozone layer recovery falters unexpectedly. The Earth’s protective ozone layer is not recovering uniformly from the damage caused to it by industry and other human activities. And scientists are not sure why it isn’t. An international research team says the ozone, which protects humans and other species from harmful ultraviolet radiation, is continuing to recover at the poles. But recovery at lower latitudes, where far more people live, is not. The layer has been declining since the 1970s because of the effect of man-made chemicals, chiefly chlorofluorocarbons (CFCs) and similar gases, used mainly in refrigerants and aerosols. There is a link between the CFCs and global warming, though they are different and neither is the main cause of the other. Some suggested CFC replacements themselves proved to be powerful greenhouse gases. CFCs and the other gases were banned under an international agreement, the Montreal Protocol, and since then parts of the layer have been recovering, particularly at the poles. But the latest research, published in the journal Atmospheric Chemistry and Physics, finds that the bottom part of the ozone layer at more populated latitudes is not recovering, for reasons so far unidentified. Read More here

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12 January 2018, Reuters, Warming set to breach Paris accord’s toughest limit by mid century: draft. Global warming is on track to breach the toughest limit set in the Paris climate agreement by the middle of this century unless governments make unprecedented economic shifts from fossil fuels, a draft U.N. report said. The draft, of a report due for publication in October, said governments will also have to start sucking carbon dioxide from the air to achieve the ambition of limiting temperatures to 1.5 degrees Celsius (2.7 Fahrenheit) above pre-industrial times. “There is very high risk that … global warming will exceed 1.5 degrees Celsius above pre-industrial levels,” the U.N. panel of experts wrote, based on the current pace of warming and current national plans to limit their greenhouse gas emissions. There were no historic precedents for the scale of changes required in energy use, to shift from fossil fuels to renewable energies, and in reforms ranging from agriculture to industry to stay below the 1.5C limit, it said. The draft, by the U.N.’s Intergovernmental Panel on Climate Change (IPCC) of leading scientists and obtained by Reuters, says average surface temperatures are about 1C above pre-industrial times and that average temperatures are on track to reach 1.5C by the 2040s.  Curbing warming to 1.5C would help limit heat extremes, droughts and floods, more migration of people and even risks of conflict compared to higher rates of warming, according to the draft summary for policymakers. But a 1.5C rise might not be enough to protect many coral reefs, already suffering from higher ocean temperatures, and ice stored in Greenland and West Antarctica whose melt is raising sea levels. Read More here. For expert response read more here