Citat:
kako su zaledjene povrsine izgledale pre par godina i mnogo pre i danas. Da bi vide(li)o kolko je zaista otopljeno leda.
Ne znam za slike, ali ispod je info. Čini se da prije 1979. godine nitko nije niti istraživao veličinu/količinu leda na polovima. Tako da su podaci iz 1979. znanstveno uzeti kao bazični. Drugim riječima
ne zna se kako su izgledali (puno) prije.
Koji koristan info bi mogao biti u dnevnicima starih moreplovaca.
I možda odraženi na nekim kartama ako bi se mogle naći vjerodostojne karte koje nisu "tempered" i uz to koje bi se mogle validno datirati.
Ovako, '79 je početna točka:
https://www.forbes.com/sites/jamestaylo ... 432c728921ako ukinu stranicu kao što su ukinuli i link s nje, evo par izvadaka:
"Earth’s polar ice caps have not receded at all since the satellite instruments began measuring the ice caps in 1979. Since the end of 2012, moreover, total polar ice extent has largely remained above the post-1979 average. The updated data contradict one of the most frequently asserted global warming claims – that global warming is causing the polar ice caps to recede."
"polar ice caps remained at approximately their 1979 extent until the middle of the last decade. Beginning in 2005, however, polar ice modestly receded for several years. By 2012, polar sea ice had receded by approximately 10 percent from 1979 measurements."
"In late 2012, however, polar ice dramatically rebounded and quickly surpassed the post-1979 average. Ever since, the polar ice caps have been at a greater average extent than the post-1979 mean.
Now, in May 2015, the updated NASA data show polar sea ice is approximately 5 percent above the post-1979 average."