Sentences with phrase «with global cooling period»

But the results of studying earth climate in the past, indicates we currently in an unusual cool period, and that human evolution coincided with global cooling period.

Not exact matches

This timeframe is particularly relevant for the evolution of past climate as it is a period of intense cooling coupled with increased aridity at a global scale.

As discussed elsewhere on this site, modeling studies indicate that the modest cooling of hemispheric or global mean temperatures during the 15th - 19th centuries (relative to the warmer temperatures of the 11th - 14th centuries) appears to have been associated with a combination of lowered solar irradiance and a particularly intense period of explosive volcanic activity.

Overall the results suggest that the Southern Oscillation exercises a consistently dominant influence on mean global temperature, with a maximum effect in the tropics, except for periods when equatorial volcanism causes ad hoc cooling.

«The first part will trace the history of scientific study of climate change, beginning with scientific inquiry into the formation and melting of the ice ages, periods of historical cooling and warming, smog, ozone, nuclear winter, volcanoes, and global warming.

The analysis focuses on a period beginning after World War 2 when a decades - long climb in global temperatures stopped, with the northern hemisphere, particularly, cooling somewhat.

• Greenhouse gases contributed a global mean surface warming likely to be in the range of 0.5 °C to 1.3 °C over the period 1951 to 2010, with the contributions from other anthropogenic forcings, including the cooling effect of aerosols, likely to be in the range of − 0.6 °C to 0.1 °C.

If you're relatively familiar with the climate «debate», you will know that the rapid cooling period from the 1940's to the 1970's led to climate «experts» (climate scientists) declaring the end of life as we know it, in the form of the «Global Cooling»cooling period from the 1940's to the 1970's led to climate «experts» (climate scientists) declaring the end of life as we know it, in the form of the «Global Cooling»Cooling» scare:

Interestingly, the paper «Climate Trends and Global food production since 1980» (Lobell, Schlenker, Costa - Roberts, in Sciencexpress, 5 May, Science 1204531) confirms my finding of the absence of climate change in the USA: «A notable exception to the [global] warming pattern is the United States, which produces c. 40 % of global maize and soybean and experienced a slight cooling over the period... the country with largest overall share of crop production (United States) showed no [adverse] effect due to the lack of significant climate trends&rGlobal food production since 1980» (Lobell, Schlenker, Costa - Roberts, in Sciencexpress, 5 May, Science 1204531) confirms my finding of the absence of climate change in the USA: «A notable exception to the [global] warming pattern is the United States, which produces c. 40 % of global maize and soybean and experienced a slight cooling over the period... the country with largest overall share of crop production (United States) showed no [adverse] effect due to the lack of significant climate trends&rglobal] warming pattern is the United States, which produces c. 40 % of global maize and soybean and experienced a slight cooling over the period... the country with largest overall share of crop production (United States) showed no [adverse] effect due to the lack of significant climate trends&rglobal maize and soybean and experienced a slight cooling over the period... the country with largest overall share of crop production (United States) showed no [adverse] effect due to the lack of significant climate trends».

Periods of weak solar cycles are associated with periods of global cPeriods of weak solar cycles are associated with periods of global cperiods of global cooling.

Greenhouse gases contributed a global mean surface warming likely to be in the range of 0.5 °C to 1.3 °C over the period 1951 − 2010, with the contributions from other anthropogenic forcings, including the cooling effect of aerosols, likely to be in the range of − 0.6 °C to 0.1 °C.

lends support to the idea that a period of global cooling occurred later during the mid-twentieth century as a result of sulphate aerosols being released during the 1950s with the rise of industrial output.

For instance, extreme weather events occurred with about the same frequency during the 1945 - 77 global cooling period as they do today, yet no climate scientist pointed to human activity as being responsible in the earlier period.

«The existence of the Little Ice Age and the Medieval Warm Period were an embarrassment to the global - warming establishment, because they showed that the current warming is almost indistinguishable from previous warming and coolings that had nothing to do with burning fossil fuel.

Stepping back from there, Hansen looks at 1940 and above: «The approximate stand - still of global temperature during 1940 - 1975 is generally attributed to an approximate balance of aerosol cooling and greenhouse gas warming during a period of rapid growth of fossil fuel use with little control on particulate air pollution, but quantitative interpretation has been impossible» That's the excuse and it is laughable.

The approximate stand - still of global temperature during 1940 - 1975 is generally attributed to an approximate balance of aerosol cooling and greenhouse gas warming during a period of rapid growth of fossil fuel use with little control on particulate air pollution, but quantitative interpretation has been impossible because of the absence of adequate aerosol measurements.

(See: NYT: Missing Its Spots: «Sun may be on verge of falling into an extended slumber» — could cause «extended chilly period» — «Cosmic ray levels correlate well with climate extending back thousands of years» — July 21, 2009 & Also see: «Sun Sleeps»: Danish Scientist declares «global warming has stopped and a cooling is beginning... enjoy global warming while it lasts» — Sun is «heading towards «a grand minimum» as we saw in Little Ice Age» — Sept. 11, 2009)

The global warming signal itself is a multidecadal feature of the climate, but just like the seasonal example above, it has been possible at times to take one period of one temperature record - surface air temperatures in most cases - and do a «January - February» job with it, thereby making the claim that temperatures are flatlining or even cooling.

Of course, the present period with lack of discernible global warming or cooling will come to an end sometime.

We now know that climate cycles and the global warming of the last 300 years are consistent with recovery from the LIA with periods of no - warming and cooling provided by shorter cycles.

We found that the world naturally switches between periods of global warming and periods of global cooling, with each period lasting several decades.

«Key Points ■ Models run with human forcing can produce 10 - year periods with little warming» Global warming ended after 1998 and the Earth has been cooling since 2002.

Another paper discusses how atmospheric humidity increased during the recent period of pronounced global warming (from about the late 1970s to the present), with a humidity decrease during the cooling / temperature stagnation period of ~ 1940s to the 1970s:

«In the nearest future we will observe a transition (between global warming and global cooling) period of unstable climate changes with the global temperature fluctuating around its maximum value reached in 1998 - 2005.

«The first part will trace the history of scientific study of climate change, beginning with scientific inquiry into the formation and melting of the ice ages, periods of historical cooling and warming, smog, ozone, nuclear winter, volcanoes, and global warming,» the filing explained.

While a long - term trend is for global warming, short - term periods of cooling can occur and have physical causes associated with natural variability.

This period has been widely studied because the radiative forcings and boundary conditions are relatively well known and because the global cooling during that period is comparable with the projected warming over the 21st century.

Yah, it cools a bit, then it warms a bit, then it cools... as Dr Courtney reminds us, the classic averaging period to discern the long term climate signal is thirty years and over this period all the global temperature series show a warming trend in line with that predicted by AGW.

«Luetkemeyer's legislation would prohibit U.S. contributions to the IPCC, which is nothing more than a group of U.N. bureaucrats that supports man - made claims on global warming that many scientists disagree with... Meanwhile, our very own Environmental Protection Agency recently reported that we are undergoing a period of worldwide cooling.»

We have just started a sixth period with the proposed name of Anthropocene, that should last around 2,200 years, until about 4,200 C.E. Every one of the last five periods (since 10.2 kyr ago) started with global warming as a recovery from the depressed temperatures of the cooling oscillations that separate the periods.

Adding data from around the world, however, indicates that the Medieval Warm Period was mainly a regional phenomenon, with warming in one region offsetting cooling in other regions, leaving little change in the average global temperature.

The approximate stand - still of global temperature during 1940 - 1975 is generally attributed to an approximate balance of aerosol cooling and greenhouse gas warming during a period of rapid growth of fossil fuel use with little control on particulate air pollution, but satisfactory quantitative interpretation has been impossible because of the absence of adequate aerosol measurements.

The approximate stand - still of global temperature during 1940 - 1975 is generally attributed to an approximate balance of aerosol cooling and greenhouse gas warming during a period of rapid growth of fossil fuel use with little control on particulate air pollution -LSB-...]»

The IPCC compared the recent global warming rate with global warming rate for a longer period that has a combination this recent warming and previous global cooling phase and declared to the world «accelerated warming.»

There are also some interesting sociological studies which suggest that the high points of human civilization appear to coincide with periods of global warmth (Roman Empire, Rapid european growth in middle ages, modern era of growth) while periods of cooler climate have coincided with the low points in human civilization (collapse of Rome, Dark ages, black death, european population collapse, famine)

Greenland ice cores indicate that the start of the instrumented data (thermometers) coincides with a cold period in the northern hemisphere and that at the site of a well - studied ice core (Global Cooling - Doomsday Called Off), the temperature in the mid 1800s was the coldest in 8,000 years.

It does make more sense that a long period of atmospheric cooling would lead to a lowering of sea level, but that correlation has NOTHING to do with CO2 emissions, which were skyrocketing while global temperatures either fell or remained steady.

Plain Language Summary: Global and regional warming trends over the course of the twentieth century have been nonuniform, with decadal and longer periods of faster or slower warming, or even cooling.