Sentences with phrase «warming over the past century»

Previous research has shown the tropical Pacific has warmed over the past century due to increased greenhouse gas emissions.

Terrestrial ecosystems have encountered substantial warming over the past century, with temperatures increasing about twice as rapidly over land as over the oceans.

Although the earth has experienced exceptional warming over the past century, to estimate how much more will occur we need to know how temperature will respond to the ongoing human - caused rise in atmospheric greenhouse gases, primarily carbon dioxide.

Rather than using complex computer models to estimate the effects of greenhouse - gas emissions, Lovejoy examines historical data to assess the competing hypothesis: that warming over the past century is due to natural long - term variations in temperature.

«So, working independently, several research teams have converged on almost identical results for warming over the past century at the global scale, but with periodic fine - tuning as additional information becomes available,» Holt and Field write.

Moore argued that the current argument that the burning of fossil fuels is driving global warming over the past century lacks scientific evidence.

Personally I got convinced that warming was underway in the late 1990s after borehole measurements in rocks around the world, far away from civilization, showed unmistakable evidence of warming over the past century... if you log temperature down the hole, you find that extra heat has been seeping down from the surface.

The paper was accompanied by a press release entitled «Global Warming not a Man - made Phenomenon», in which Shaviv was quoted as stating, «The operative significance of our research is that a significant reduction of the release of greenhouse gases will not significantly lower the global temperature, since only about a third of the warming over the past century should be attributed to man».

``... I am one of the strong supporters of the proposition that the available records indicate climate warming over the past century or so.

* Our burning of fossil fuels» That's a total lie, proven by the fact that you can't cite a single peer reviewed paper that empirically shows that anthropogenic CO2 has been the primary cause of the climate warming over the past century.

«Further, virtually all agree that the planet has warmed over the past century, and that humans have had some impact on the climate.

The text says «Most scientists agree that the earth has gotten a bit warmer over the past century.

The PAGES 2k team found that a global surface cooling trend over the past 2,000 years has been erased by the global warming over the past century.

Thus volcanoes have not caused the long - term global warming over the past century, and can explain only a small fraction of the warming over the past 25 years.

These observations, together with computer model simulations and historical climate reconstructions from ice cores, ocean sediments and tree rings all provide strong evidence that the majority of the warming over the past century is a result of human activities.

In conclusion, there is simply no supporting evidence or physics behind the claim that the global warming over the past century could simply be attributed to internal variability.

Internal variability can only account for ~ 0.3 °C change in average global surface air temperature at most over periods of several decades, and scientific studies have consistently shown that it can not account for more than a small fraction of the global warming over the past century.

Spencer also attributes most of the global warming over the past century to this «internal radiative forcing.»

The observed warming over the past century, even if it were all due to increases in carbon dioxide, would not imply any greater warming.

Previous research has shown the tropical Pacific has warmed over the past century due to increased greenhouse gas emissions.

Although the earth has experienced exceptional warming over the past century, to estimate how much more will occur we need to know how temperature will respond to the ongoing human - caused rise in atmospheric greenhouse gases, primarily carbon dioxide.

For example, if a paper were to say «the sun caused most of the global warming over the past century,» that would be included in the less than 3 % of papers rejecting or minimizing human - caused global warming.

First, no one I know disputes that the global climate has been warming over the past century and a half, that sea levels have indeed been rising, or that human activities, including carbon dioxide emissions, have and will continue to contribute «some influence.»

You can always try to use the magnitude of the warming over the past century itself to constrain cloud feedback, but this gets convolved with estimates of aerosol forcing and internal variability.

Shaviv and Veizer's paper was accompanied by a press release titled «Global warming not a man - made phenomenon», in which Shaviv is quoted stating: «The operative significance of our research is that a significant reduction of the release of greenhouse gases will not significantly lower the global temperature, since only about a third of the warming over the past century should be attributed to man».

«No one I know disputes that the global climate has been warming over the past century and a half, that sea levels have indeed been rising, or that human activities, including carbon dioxide emissions, have and will continue to contribute «some influence.»

If we take the lower end of this range, even a 2 °C climate sensitivity would mean that humans have been responsible for more than half of the global warming over the past century.

Scientists have investigated these natural mechanisms (the Sun, volcanoes, the Earth's orbital cycles, etc.), and they simply can not explain the global warming over the past century.

Despite dataset and modelling uncertainty, these results, together with the understanding of the causes of observed warming over the past century, provide substantial evidence of a human contribution to the observed decline in Northern Hemisphere spring snow cover extent.

Moore argued that the current argument that the burning of fossil fuels is driving global warming over the past century lacks scientific -LSB-...]

For instance, as temperatures have warmed over the past century, the prevalence and duration of drought has increased in the American West [2].

We show that although increases in greenhouse - gas concentrations have driven the observed warming over the past century, approximately 60 % of the greenhouse - gas - induced warming has been offset by the combined response to other anthropogenic forcings, which is substantially greater than the fraction of global greenhouse - gas - induced warming that has been offset by these forcings.

The fundamental conclusion in Lean and Rind's paper is that the observed global warming over the past century, and especially over the past 25 - 50 years, is predominantly human - caused:

Since human - caused global surface warming over the past century has already exceeded 0.4 °C,

There has been some warming over the past century, though it stopped about a decade and a half ago.

The fact is that the actual peer - reviewed scientific research shows that (a) the rate of warming over the past century is unprecedented as far back as the 20,000 years paleoclimate scientists are able to extend the record and (b) that warming can ONLY be explained by human influences.

Even if we could assign a certain fraction of warming over the past century or so to natural variation, we still would face very large uncertainty in aerosol influences... and modelers would continue to use those vastly uncertain aerosol influences as as a «free» variable to «tune» the models.

«How can we use the spatial pattern of the surface temperature evolution to help determine how much of the warming over the past century was forced by increases in the well - mixed greenhouse gases (WMGGs: CO2, CH4, N2O, CFCs), assuming as little as possible about the non-WMGG forcing and internal variability.»

We have already pointed out that the text accepts that «Most scientists agree that the earth has gotten a bit warmer over the past century.

View enlarged image Models that account only for the effects of natural processes are not able to explain the warming over the past century.

What is grossly left out of the conversation (at least here) is how extremely inaccurate any model would be if the effects of anthropogenic warming over the past century are removed.

Dr Richard S. Lindzen states: «If one assumes all warming over the past century is due to anthropogenic greenhouse forcing, then the derived sensitivity of the climate to a doubling of CO2 is less than 1C.»

None but the most radical alarmists claim that all of the warming over the past century is anthropogenic.

This is because the warming over the past century is much larger than what could have come about due to natural variation.

In another study, 22 of 35 European butterfly species were shown to have shifted their ranges northward as the climate warmed over the past century.

For the record I think the clear trend from the published data is that the earth has warmed over the past century.

As illustrated above, neither direct nor indirect solar influences can explain a significant amount of the global warming over the past century, and certainly not over the past 30 years.

Not exact matches

Because of the strong recent warming, the updated trend over 1906 to 2005 is now 0.74 ± 0.18 degree C. Note that the 1956 to 2005 trend alone is 0.65 ± 0.15 degree C, emphasizing that the majority of 20th - century warming occurred in the past 50 years.

In particular, the modelers could now reproduce in detail the pattern of warming, changes in rainfall, etc. actually observed in different regions of the world over the past century.

While Earth's landmass has warmed by about 1 degree Celsius (about 2 degrees Fahrenheit) over the past century, on average, land temperatures in the Arctic have risen almost 2 C (3.6 F).