There is medium confidence that approximately 20 - 30 % of species assessed so far are likely to be at increased risk if increases
in global average warming exceed 1.5 - 2.5 oC (relative to 1980 - 1999).
[24] I believe that a 2.0 C
in global average warming, or even more, would be in balance beneficial, partly because most warming occurs where it is now cold and very little occurs in the tropics.
There is medium confidence that approximately 20 to 30 percent of species assessed so far are likely to be at increased risk of extinction if increases
in global average warming exceed 1.5 to 2.5 °C (relative to 1980 to 1999).
Not exact matches
There is a direct connection between the current changes
in the world's atmosphere and the rise
in average temperature; this is known as
global warming or the «greenhouse effect».
The LCA examined the effects of a 1 kilogram industry -
average corrugated product manufactured
in 2014 on seven environmental impact indicators:
global warming potential (greenhouse gas emissions), eutrophication, acidification, smog, ozone depletion, respiratory effects, fossil fuel depletion; and four inventory indicators: water use, water consumption, renewable energy demand, and non-renewable energy demand.
Most scientists and climatologists agree that weird weather is at least
in part the result of
global warming — a steady increase
in the
average temperature of the surface of the Earth thought to be caused by increased concentrations of greenhouse gasses produced by human activity.
During the Eocene, the concentration of carbon dioxide
in the atmosphere was more than 560 parts per million, at least twice preindustrial levels, and the epoch kicked off with a
global average temperature more than 8 degrees Celsius — about 14 degrees Fahrenheit —
warmer than today, gradually cooling over the next 22 million years.
One aerosol, black carbon, is of increasing concern for Arctic nations worried about the pace of climate change
in the far north, which is
warming twice as fast as the
global average.
That includes the potential for abrupt climate change and the factors amplifying
warming in the Arctic, which is
warming twice as fast as the
global average.
But they've been especially interested
in the most recent period of abrupt
global warming, the Bølling - Allerød, which occurred about 14,500 years ago when
average temperatures
in Greenland rose about 15 degrees Celsius
in about 3,000 years.
Combining the asylum - application data with projections of future
warming, the researchers found that an increase of
average global temperatures of 1.8 °C — an optimistic scenario
in which carbon emissions flatten globally
in the next few decades and then decline — would increase applications by 28 percent by 2100, translating into 98,000 extra applications to the EU each year.
The
average global temperature change for the first three months of 2016 was 1.48 °C, essentially equaling the 1.5 °C
warming threshold agreed to by COP 21 negotiators
in Paris last December.
Three approaches were used to evaluate the outstanding «carbon budget» (the total amount of CO2 emissions compatible with a given
global average warming) for 1.5 °C: re-assessing the evidence provided by complex Earth System Models, new experiments with an intermediate - complexity model, and evaluating the implications of current ranges of uncertainty
in climate system properties using a simple model.
The work by Mark Jacobson, director of Stanford University's Atmosphere / Energy program and a fellow at the university's Woods Institute, argues that cutting emissions of black carbon may be the fastest method to limit the ongoing loss of ice
in the Arctic, which is
warming twice as fast as the
global average.
Melting sea ice has accelerated
warming in the Arctic, which
in recent decades has
warmed twice as quickly as the
global average, according to a new study.
The strength and path of the North Atlantic jet stream and the Greenland blocking phenomena appear to be influenced by increasing temperatures
in the Arctic which have
averaged at least twice the
global warming rate over the past two decades, suggesting that those marked changes may be a key factor affecting extreme weather conditions over the UK, although an Arctic connection may not occur each year.
Changes
in the number of cosmic rays hitting the atmosphere due to changes
in solar activity can not explain
global warming, as
average cosmic ray intensities have been increasing since 1985 even as the world has
warmed — the opposite of what should happen if cosmic rays produce climate - cooling clouds.
«The result is not a surprise, but if you look at the
global climate models that have been used to analyze what the planet looked like 20,000 years ago — the same models used to predict
global warming in the future — they are doing, on
average, a very good job reproducing how cold it was
in Antarctica,» said first author Kurt Cuffey, a glaciologist at the University of California, Berkeley, and professor of geography and of earth and planetary sciences.
The results show that even though there has been a slowdown
in the
warming of the
global average temperatures on the surface of Earth, the
warming has continued strongly throughout the troposphere except for a very thin layer at around 14 - 15 km above the surface of Earth where it has
warmed slightly less.
Bowen and colleagues report that carbonate or limestone nodules
in Wyoming sediment cores show the
global warming episode 55.5 million to 55.3 million years ago involved the
average annual release of a minimum of 0.9 petagrams (1.98 trillion pounds) of carbon to the atmosphere, and probably much more over shorter periods.
So if you think of going
in [a]
warming direction of 2 degrees C compared to a cooling direction of 5 degrees C, one can say that we might be changing the Earth, you know, like 40 percent of the kind of change that went on between the Ice Age; and now are going back
in time and so a 2 - degree change, which is about 4 degrees F on a
global average, is going to be very significant
in terms of change
in the distribution of vegetation, change
in the kind of climate zones
in certain areas, wind patterns can change, so where rainfall happens is going to shift.
Global warming has been going on for so long that most people were not even born the last time the Earth was cooler than
average in 1985
in a shift that is altering perceptions of a «normal» climate, scientists said.
With an El Niño now under way — meaning
warm surface waters
in the Pacific are releasing heat into the atmosphere — and predicted to intensify, it looks as if the
global average surface temperature could jump by around 0.1 °C
in just one year.
One of the planet's hotspots has been the outsized
warming in the Arctic, which is seeing a temperature rise double that of the
global average.
Even if
global warming is limited to these levels, changes
in regional temperatures (and therefore climate change impacts) can vary significantly from the
global average.
Statistical analysis of
average global temperatures between 1998 and 2013 shows that the slowdown
in global warming during this period is consistent with natural variations
in temperature, according to research by McGill University physics professor Shaun Lovejoy.
In the latter half of the decade, La Niña conditions persisted in the eastern and central tropical Pacific, keeping global surface temperatures about 0.1 degree C colder than average — a small effect compared with long - term global warming but a substantial one over a decad
In the latter half of the decade, La Niña conditions persisted
in the eastern and central tropical Pacific, keeping global surface temperatures about 0.1 degree C colder than average — a small effect compared with long - term global warming but a substantial one over a decad
in the eastern and central tropical Pacific, keeping
global surface temperatures about 0.1 degree C colder than
average — a small effect compared with long - term
global warming but a substantial one over a decade.
«
Global fisheries to be, on
average, 20 percent less productive
in 2300, UCI study finds:
Warming - induced plankton growth near Antarctica will impair marine food chain.»
Average composite reflectivity over the CONUS (contiguous US) domain
in all 13 years of the simulations are shown by season (May - June and July - August) and by simulation type (control and psuedo
global warming).
As Pat Michaels, a climatologist and self - described
global warming skeptic at the Cato Institute testified to Congress
in July, certain studies of sensitivity published since 2011 find an
average sensitivity of 2 degrees C.
Although
average summer storm activity decreases, the most intense winter storms are projected to increase
in frequency under continued
global warming.
The second simulation overlaid that same weather data with a «pseudo
global warming» technique using an accepted scenario that assumes a 2 - to 3 - degree increase
in average temperature, and a doubling of atmospheric carbon dioxide.
Their findings, based on output from four
global climate models of varying ocean and atmospheric resolution, indicate that ocean temperature
in the U.S. Northeast Shelf is projected to
warm twice as fast as previously projected and almost three times faster than the
global average.
«
Warming in the Andes is occurring at a rate nearly twice the
global average and it's already impacting water resources as shown
in this research.
In contrast, the consensus view among paleoclimatologists is that the Medieval
Warming Period was a regional phenomenon, that the worldwide nature of the Little Ice Age is open to question and that the late 20th century saw the most extreme
global average temperatures.
Results of a new study by researchers at the Northeast Climate Science Center (NECSC) at the University of Massachusetts Amherst suggest that temperatures across the northeastern United States will increase much faster than the
global average, so that the 2 - degrees Celsius
warming target adopted
in the recent Paris Agreement on climate change will be reached about 20 years earlier for this part of the U.S. compared to the world as a whole.
Without any action, the world is on track to achieve at least 4 degrees C
warming of
global average temperatures by 2100, as the world hits 450 parts - per - million of greenhouse gases
in 2030 and goes on to put out enough greenhouse gas pollution to achieve as much as 1300 ppm by 2100.
Regional conditions do not necessarily mirror the
global average, Stott notes: «Iceland and Greenland had their
warmest periods
in the 1930s, whereas the
warmest for the globe was the 1990s.»
Aerosols are already known to reduce
global warming: The vast clouds of sulfates thrown up
in the 1991 eruption of Mount Pinatubo
in the Philippines, for example, reduced
average global temperatures by about half a degree Celsius.
In its annual analysis of trends in global carbon dioxide emissions, the Global Carbon Project (GCP) published three peer - reviewed articles identifying the challenges for society to keep global average warming less than 2 °C above pre-industrial level
In its annual analysis of trends
in global carbon dioxide emissions, the Global Carbon Project (GCP) published three peer - reviewed articles identifying the challenges for society to keep global average warming less than 2 °C above pre-industrial level
in global carbon dioxide emissions, the Global Carbon Project (GCP) published three peer - reviewed articles identifying the challenges for society to keep global average warming less than 2 °C above pre-industrial l
global carbon dioxide emissions, the
Global Carbon Project (GCP) published three peer - reviewed articles identifying the challenges for society to keep global average warming less than 2 °C above pre-industrial l
Global Carbon Project (GCP) published three peer - reviewed articles identifying the challenges for society to keep
global average warming less than 2 °C above pre-industrial l
global average warming less than 2 °C above pre-industrial levels.
«The long - term baseline temperature is about three tens of a degree (C)
warmer than it was when the big El Niño of 1997 - 1998 began, and that event set the one - month record with an
average global temperature that was 0.66 C (almost 1.2 degrees F)
warmer than normal
in April 1998.»
The continued top ranking for 2016 may be due
in part to El Niño, a cyclical climate event characterized by
warmer - than -
average waters
in the equatorial Pacific Ocean, which generated some of the
global heat that year.
While 2014 temperatures continue the planet's long - term
warming trend, scientists still expect to see year - to - year fluctuations
in average global temperature caused by phenomena such as El Niño or La Niña.
January through August of 1998 are all
in the 14
warmest months
in the satellite record, and that El Niño started when
global temperatures were somewhat chilled; the
global average temperature
in May 1997 was 0.14 C (about 0.25 degrees F) cooler than the long - term seasonal norm for May.
Surface water
in the region is
warming at twice the rate of the
global average.
Since the 1970s the northern polar region has
warmed faster than
global averages by a factor or two or more,
in a process of «Arctic amplification» which is linked to a drastic reduction
in sea ice.
Phenomena such as El Niño or La Niña, which
warm or cool the tropical Pacific Ocean, can contribute to short - term variations
in global average temperature.
The UN Intergovernmental Panel on Climate Change (IPCC) has estimated that the
average global warming in this century will rise by 4 °C
in a business - as - usual scenario.
The impacts of
global warming are felt especially
in mountainous regions, where the rise
in temperatures is above
average, affecting both glacierized landscapes and water resources.
The atmosphere
in the polar regions has
warmed at about twice the
average rate of
global warming with Arctic coasts experiencing a rise
in the occurrence of storm surges.