Sentences with phrase «occurred over the course of decades»

Not exact matches

And even if we assume it's accurate, when we consider that pH naturally rises and falls by about + / -0.5 over the course of a single decade, this means that natural changes in seawater pH occur at rates 100s of times faster than the trend attributed to anthropogenic CO2.

However, over the course of the last decade, the publishing world has undergone an indie revolution similar to what occurred in the film and music industries.

It is prudent to expect that over the course of a decade some climate events — including single events, conjunctions of events occurring simultaneously or in sequence in particular locations, and events affecting globally integrated systems that provide for human well - being — will produce consequences that exceed the capacity of the affected societies or global systems to manage and that have global security implications serious enough to compel international response.

We don't compare the temperature change that occurred over the course of 1 year to the change that occurred over a 35 - year period and claim that because the 1 - year period changed by, say, 0.5 °C (like 2015 to 2016 did), that therefore we are warming at a rate o 5.0 °C per decade and this is 30 times faster than the 1979 - 2014 rate (0.12 °C per decade).

RealClimate is wonderful, and an excellent source of reliable information.As I've said before, methane is an extremely dangerous component to global warming.Comment # 20 is correct.There is a sharp melting point to frozen methane.A huge increase in the release of methane could happen within the next 50 years.At what point in the Earth's temperature rise and the rise of co2 would a huge methane melt occur?No one has answered that definitive issue.If I ask you all at what point would huge amounts of extra methane start melting, i.e at what temperature rise of the ocean near the Artic methane ice deposits would the methane melt, or at what point in the rise of co2 concentrations in the atmosphere would the methane melt, I believe that no one could currently tell me the actual answer as to where the sharp melting point exists.Of course, once that tipping point has been reached, and billions of tons of methane outgass from what had been locked stores of methane, locked away for an eternity, it is exactly the same as the burning of stored fossil fuels which have been stored for an eternity as well.And even though methane does not have as long a life as co2, while it is around in the air it can cause other tipping points, i.e. permafrost melting, to arrive much sooner.I will reiterate what I've said before on this and other sites.Methane is a hugely underreported, underestimated risk.How about RealClimate attempts to model exactly what would happen to other tipping points, such as the melting permafrost, if indeed a huge increase in the melting of the methal hydrate ice WERE to occur within the next 50 years.My amateur guess is that the huge, albeit temporary, increase in methane over even three or four decades might push other relevent tipping points to arrive much, much, sooner than they normally would, thereby vastly incresing negative feedback mechanisms.We KNOW that quick, huge, changes occured in the Earth's climate in the past.See other relevent posts in the past from Realclimate.Climate often does not change slowly, but undergoes huge, quick, changes periodically, due to negative feedbacks accumulating, and tipping the climate to a quick change.Why should the danger from huge potential methane releases be vievwed with any less trepidation?