The Anthropocene’s Birthday, or the birthyear of human-accelerated climate change.
Scientists have found a major spike in the amount of Carbon-14 within the tree rings of “The Loneliest Tree In The World,” which ring corresponds to October-December 1965.
This tree is a Sitka Spruce, a species from the American Northwest (and into Canada) that was planted on Campbell Island in 1901 (or 1905), which island is in the Southern Ocean about 400 miles south of the southern tip of New Zealand.
There are no other trees on Campbell Island, just low scrubs. Since the next landmass south of Campbell Island is Antarctica, this tree is the furthest one south on Earth (so far as I can tell). The next closest tree is north about 170 miles, on another small island south of New Zealand.
The significance of this finding is that geologists now know that the start of the Anthropocene – which is the geological Epoch (after the Holocene Epoch) when GLOBAL (not just local) climate is clearly being influenced by human activity and at an accelerating rate – began in 1965. The Holocene Epoch occurred from -11,700 to 1965.
The Carbon-14 marker is from the radioactive fallout from atmospheric nuclear bomb testing, which grew from 1945 and peaked in 1962, after which it stopped in 1963 as a result of the Test Ban treaty of that year (except for a few isolated atmospheric tests since).
The accumulated radioactive fallout from the massive testing of the 1950s and early 1960s (with a huge amount in 1962) had finally spread out uniformly through the global atmosphere, and the Carbon-14 from that fallout was being infused into trees globally through the process of photosynthesis.
So, this spike in tree-ring Carbon-14 in 1965 is a GLOBAL marker of human activity on global climate, and thus marks the ‘birthday’ of human-induced/accelerated Climate Change.
Coring “the loneliest tree in the world”
The geophysical transition of 1965, noted above, was imperceptible to the human senses, but it is a very significant event/transition in the history of Planet Earth.
You should easily be able to find internet sources giving all the scientific details including charts/graphs of the actual Carbon-14 signature (of the subject tree) over time, which clearly displays the spike during 1965. This same spike was found in trees sampled in the Northern Hemisphere as well, and since there was the same marker on trees globally – for the first time – it was clear the spike indicated a uniformly global effect. And that effect was caused by humans. Hence, the birth of the Anthropocene.
Geologists are now updating their table of geological supereon-eon-era-period-epoch-age, and all textbooks will have to be updated. The last Epoch (the Holocene) of the Quaternary Period extended from 11,700 years ago, when the last glacial retreat was clearly accelerating and the Ice Ages were over, and 1965 when humanity now had leverage on the global climate: the Anthropocene.
When will the next Epoch begin, and how will it be determined (and will there be any ‘who’ to do so)?
The part of this posting down to and including the weblink to the tree coring video were published online at Counterpunch, see below.
The Anthropocene’s Birthday, or the Birth-Year of Human-Accelerated Climate Change
22 February 2018
by Manuel García, Jr.