Sentences with phrase «warmer than at any time in the past»

Not exact matches

Some show far more variability leading up to the 20th century than the hockey stick, but none suggest that it has been warmer at any time in the past 1000 years than in the last part of the 20th century.

«The climate changed quite often from warmer to colder, and vice versa, but at all times it was much colder than the interglacial period that we have lived in for the past 10,000 years.»

It's true that at times in Earth's past the climate has been as warm or even warmer than temperatures projected for the end of this century and beyond.

Another trick of contrarians: refer to past cooling as «dramatic» (even though it was slow and slight) and modern warming as «slow» (even though it's * much * faster than at any time in at least 2000 years).

You keep ignoring the fact that there is no evidence for methane burps associated with conditions in the relatively recent past (early Holocene, Eemian) for which there is good evidence for warmer Arctic conditions than now, and you are happy to extrapolate emissions of a few Tg (at most) to values 1000 times larger on the basis of nothing very much.

Their two main results are a confirmation that current global surface temperatures are hotter than at any time in the past 1,400 years (the general «hockey stick» shape, as shown in Figure 1), and that while the Medieval Warm Period (MWP) and Little Ice Age (LIA) are clearly visible events in their reconstruction, they were not globally synchronized events.

The fact that this ice didn't melt during previous warm periods does not, by itself, provide evidence that it is warmer now than at any time in the past 44,000 years, which is the implication of your comment.

And the years 2010 through 2017 were supposed to be the warmest in history, where atmospheric CO2 levels are higher than at any time in the past 10,000 years.

There certainly have been times in the past when the Earth was warmer than it is now, but climate scientists project that we're only at the start of a warming response to the CO2 that's already in the air (not to mention all the additional CO2 that will be going into the air in years to come.)

The Earth is warmer (in an average sense) now than it has been at any time during the past 2000 years because of CO2 emissions from humans burning fossil fuels.

I suspect that, BAU, the rate of warming from 1970 to 2070 could be very unusual for 100 - year periods for a long time into the past, though I'd defer to others who have studied climate records in more detail... (the sustained rate of increase in GHG forcing already is quite a bit larger than what occured in at least the last deglaciation — see graphs in ch 6 of IPCC AR4 WGI)

The argument is that because temperatures are higher now than at any time in the past 1,000 years therefore global warming is anthropogenic.

Trenberth still relates the effect from CO2 based on 100ppmv causing an increase of 0.6 °C but does not subtract the 0.5 °C of natural warming as recovery from the LIA that has nothing to do with CO2 emissions therefore producing an effect six times too high for the effect from increased CO2 Trenberth is not aware that CO2 is not increaseing at an accelerated rate as predicted by Hansen but at a near linear rate averaging 2.037 ppmv / year so by 2100 the concentration will not be as predicted by the IPCC as per scenario A1 but merely reach a level of 573.11 ppmv by 2100, This is only in the case that CO2 increase is maintained but this may not happen as the rate appears to be slowing down with the average rate for the past 5 years being lower than the rate for the past ten years.

cyclones 3 - 5 million years ago: http://www.physorg.com/news186250015.html «there were twice as many tropical cyclones during this period, and they lasted two to three days longer on average than they do now» «temperatures were up to four degrees Celsius warmer than today» on the WMO: ``... we can not at this time conclusively identify anthropogenic signals in past tropical cyclone data.»