Sentences with phrase «when decades of observations»

The space agency is launching these missions at a time when decades of observations from the ground, air, and space have revealed signs of change in Earth's ice sheets, sea ice, glaciers, snow cover and permafrost.

Not exact matches

When the ban on human dissections was lifted for a few decades, a doctor named Herophilus opened up hundreds of bodies and made detailed observations, all of which were lost when fire destroyed the famed Library of AlexandWhen the ban on human dissections was lifted for a few decades, a doctor named Herophilus opened up hundreds of bodies and made detailed observations, all of which were lost when fire destroyed the famed Library of Alexandwhen fire destroyed the famed Library of Alexandria.

In 30 years of satellite observations, the greatest extent of surface melt was recorded a decade ago, when about 75 per cent of the surface was wet.

When retired astronomer Holger Pedersen visited a basement kitchen in the Niels Bohr Institute in Copenhagen to brew a pot of tea, he discovered an unanticipated treasure trove — hundreds of photographic glass plates imprinted with astronomy observations, offering a unique view of the sky from decades long past.

I hope to be completely wrong, but my observation of world politics, the UN in particular, over the past several decades, is that just when you are certain that the Intergovernmental Panel on Chicken Chit has finaly died, it will be reborn as the World Wide Focus on Poultry Excrement (WWF - PE) and it will take ten years before anyone realizes that its all the same people just with different titles and brand new evidence much stronger than the previous evidence because they have learned from their mistakes.

When that trend reverses, as past observations suggest it will (likely within the next decade, according to Trenberth & Fasullo [2013]-RRB- we'll experience an acceleration of warming at the Earth's surface.

So I don't understand the point of your observation that BEST has been flat during the most recent decade when exactly the same can be said of all three preceding decades.

Which is another topic I have commented on, when some made the observation that once oil is exhausted, it will be hundreds of millions of years before any more is available... but I pointed out that some wells capped a few decades ago are already able to produce again... and some wells seem to recharge as fast as the oil is pumped out.

Again you may go back to scientific papers of past decades when the issue of land based observations was studied by the scientists as there was not yet much knowledge on the suitability of the available data for calculating averages of the temperature change.

Models are often tuned by running them backwards against several decades of observation, this is much too short a period to correlate outputs with observation when the controlling natural quasi-periodicities of most interest are in the centennial and especially in the key millennial range.

For a complete discussion of this see Essex: https://www.youtube.com/watch?v=hvhipLNeda4 Models are often tuned by running them backwards against several decades of observation, this is much too short a period to correlate outputs with observation when the controlling natural quasi-periodicities of most interest are in the centennial and especially in the key millennial range.

None of these could have been caused by an increase in atmospheric CO2, Model projections of warming during recent decades have greatly exceeded what has been observed, The modelling community has openly acknowledged that the ability of existing models to simulate past climates is due to numerous arbitrary tuning adjustments, Observations show no statistically valid trends in flooding or drought, and no meaningful acceleration whatsoever of pre-existing long term sea level rise (about 6 inches per century) worldwide, Current carbon dioxide levels, around 400 parts per million are still very small compared to the averages over geological history, when thousands of parts per million prevailed, and when life flourished on land and in the oceans.