The choice of 1960 as the ending date of this period was based on past changes in human influences on the climate system. (nca2014.globalchange.gov)
But I wouldn't look for fresh findings there to up - end the basic picture of a growing human influence on the climate system. (dotearth.blogs.nytimes.com)
The human influence on climate change remains a hot topic in science and politics. (wikihow.com)