Sentences with phrase «times during the past century»

Several times during the past century, chemists dreamed up new reactions, only to see them fail in the lab.

The map (top) shows population density along with the location of four major heat wave «clusters» — large geographic areas that tended to experience extreme heat at the same time during the past century.

Not exact matches

It has topped $ 100 (in today's dollars) three times in the past half century — before the recessions of the early 1980s, during the 2008 recession, and most recently in April 2011.

While it might be true that those who lived in the time of the Prophet could understand religion better than the people of today who must study Islam by means of documents only, we can not ignore the considerable change in the social situation and world conditions during the past fourteen centuries.

This protest has, however, taken the form of an equally dangerous distortion of the gospel in the opposite sense which was brought forward in the most impassioned terms at various times in the course of the nineteenth century and then especially during the past twenty years.

The team found that storm force has indeed increased over time, especially during the past century.

Although the measured speed of light has decreased only about 1 % during the past three centuries, the decrease is statistically significant, because measurement techniques can detect changes thousands of times smaller.

The oceans have heaved up and down as world temperatures have waxed and waned, but as new research tracking the past 2,800 years shows, never during that time did the seas rise as sharply or as suddenly as has been the case during the last century.

The markets, even though they have bad days or even bad years, tend to go up over time - during the past century, U.S. equities markets appreciated each year by a near 11 % average.

For the past twenty years, Kincaid's artwork has featured the interplay between painting and photography, at times referencing to the Pictorialist style that dominated photography during the late 19th century, while creating new forms of his own.

We know from data that we have caused the CO2 concentration in the atmosphere to rise sharply during the past century: it is now much higher than any time during the past 650,000 years (which is as far back as reliable ice core data exist).

Solar activity has been flat over the past half century, during which time global surface temperatures increased over a half degreee Celsius.

«As Lean notes, such a trend would require the sun to brighten more in the past century than any time in the past millennium, a dynamic unseen during 30 years of space observation.»

Sudden climate transitions during the Quaternary Abstract The time span of the past few million years has been punctuated by many rapid climate transitions, most of them on time scales of centuries to decades or even less.

On average in the United States, the amount of rain falling during the heaviest 1 percent of rainstorms has increased nearly 20 percent during the past 50 years — almost three times the rate of increase in total precipitation.4, 5 The Midwest saw an even larger average increase of 31 percent, surpassed only by the Northeast (at 67 percent).4 Scientists attribute the rise in heavy precipitation to climate change that has already occurred over the past half - century.6

The oceans have heaved up and down as world temperatures have waxed and waned, but as new research tracking the past 2,800 years shows, never during that time did the seas rise as sharply or as suddenly as has been the case during the last century.

The new findings are the latest round in a politically charged dispute over the «hockey stick,» a widely publicized graphic showing that temperatures during the late 20th century were likely higher than at any time in the past 1,000 years.

A record spanning the past half - century shows a dramatic increase (about 14 per year) in U.S. tornado reports during this time [13](Fig. 6).

More extensive and severe wildfires could shift the forests of Interior Alaska during this century from dominance by spruce to broadleaf trees for the first time in the past 4,000 to 6,000 years.89, 108

But over the last century, during which the IPCC claims the world experienced more rapid warming than any time in the past two millennia, the world did not experience significantly greater trends in any of these extreme weather events.

Here, we argue that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist.

The article claims that the twentieth century was not the warmest century in the past 1,000 years and that the climate has not changed significantly during this time.

However, the available evidence does not indicate pronounced long - term changes in the Sun's output over the past century, during which time human - induced increases in CO2 concentrations have been the dominant influence on the long - term global surface temperature increase.

Data extracted from tree rings and Antarctica ice cores indicate that solar activity has indeed fallen to unusually low levels at least three times during the past one thousand years, each drop corresponding to a long, cold spell of roughly a century in duration.

During that time, net global surface temperatures changes haven't exceeded 1 °C from the coldest to the hottest climates, though we're now approaching that degree of change, with 1 °C warming since the LIA, 0.8 °C of that over the past century, with much more to come.

Argues that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist