I didn't read the actual article. I read the article I posted from TerraDaily. It's in the May 15 issue of Nature; I can see it but I can't access it (have to pay).
As for the starting date, it seems generally agreed that climate variability combined with sulfur emissions to lower temperatures a bit in the 60s and 70s. There also seems to be general agreement that the warming beginning in the 1970s is mostly attributable to anthropogenic cause. For example of why I say that:
The problem is that the general agreement seems to be more of a movement to reinforce the notion of the arrogance of mankind itself which has a poor record of living up to its boasts.
Every week now there is a small blurb published infrequently but published nonetheless that argues against the stated relentlessness of the warming trend, cooling oceans; temperature errors having to be corrected; glaciers growing; multiplying numbers of true climate-related scientists signing on to the denier list; strong ice-pack in the Arctic; continued Pacific storms due to cold offshore water in the northwest; an oscillation bring colder water along the Alaskan coast with a likely persistence; and virtually no sunspots.
All this serves little to reinforce the notion of continued warming on anywhere near the scale of that predicted by the models from the last few decades.
This is a time of moderation not ramped-up so-called “fixes.”