Hawaii’s Mauna Loa Observatory has reported that worldwide carbon dioxide levels reached a new record high in April, hitting 410.31 parts per million (ppm). This is the highest concentration of this greenhouse gas seen over the course of human history–and prehistory, for that matter–as the Earth’s atmosphere hasn’t seen CO2 levels this high in well over 800,000 years, and possibly as long as 20 million years.
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While the idea that human-generated carbon emissions are nothing new, and the impact of greenhouse gasses on global warming have been evident for quite some time, there has been a great deal of debate over exactly how much humans have been contributing to the issue, as opposed to the natural portion of the warming cycle that the planet has been undergoing since the start of the Holocene era. But now a new study seems to have quantified our contribution — and it isn’t insignificant.
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The sound of running water has long been associated with positive health benefits, and the appealing sound of a babbling brook can be found on many recordings intended to aid relaxation and induce sleep. No countryside picnic is complete without the sweet singing of a shallow stream somewhere nearby, and water features that emulate the delicate rippling of water rivulets over rocks are popular additions to gardens all over the world.

Unfortunately new research suggests that the bubbles coming from freshwater sources may be a key and currently unaccounted for source of methane, the second-largest greenhouse gas contributor to human-driven global climate change.
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A new report released last week by the UN’s Intergovernmental Panel on Climate Change (IPCC) has further highlighted the fact that emissions of greenhouse gases worldwide have risen to unprecedented levels, despite an increasing number of global measures to reduce climate change.

The report indicates that emissions increased more rapidly in the decade spanning between 2000 and 2010 than in each of the previous three decades, and states that it would require a dramatic shift towards renewable energies in order to reverse the worrying trend.
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