Wait a minute. Half this graph falls in the period of the great global cooling hysteria. What's up with that? Furthermore, how much of this graph falls in the great warmiecoolie transition phase? Sorry, but I don't believe shit from any useful idiot global warmie snake oil salesman, nor does 90% of the American public. Go back to the your Bay Area billionaire puppet masters and tell them "no dice".
What is up is that there was NEVER a great global cooling hysteria. A handful of scientists made a claim in the 1970s in a couple of papers which were not widely accepted and yet people like you don't do their homework and have latched onto it ever since. That's what is up with that.
Oh my. They've really got you by the gonads, don't they? The coolie hysteria was sufficient to spark at least three Time Magazine covers, two Newsweek covers and countless chicken little televison scares. That went on for years. I was there.
OK, Sweetie Pie, so you get your science from Time and Newsweek. For those of us that get our science from peer reviewed journals;
Global Cooling Myth in the 70 s mdash OSS Foundation
Global Cooling Myth in the 70's
Many claim that in the 1970's all scientists believed the earth was cooling. Factual examination of the controversial report reveals that there was a consensus. The consensus was we don't know enough yet. The confirmation of the Milankovitch cycles indicated that we were to begin a cooling phase, the introduction of industrial greenhouse gases indicated we could interrupt the natural cycle. More study was needed.

Global Land-Ocean Temperature Index 2008
As in all things science and reason, context is required to understand relevance of any data or scope of understanding. In the case of the global cooling myth, let's take a look at the context.
This is around the time that the "Milankovitch Cycles' were confirmed by the deep ocean sediment core studies, thus solidifying the understanding that the earths climate system is subject to long term natural cycle influences that significantly alter our climate.
Ice age predicted in the 70's? As we show below, not really. We came out of the last ice age 15,000 years ago. Typically we would go back into an ice age as that is the
natural cycle. The industrial imposed
climate forcing is so large that we can not at this level of forcing, return to an ice age.
SOURCE FOR ARTICLE & CONTEXT:
http://www.wmconnolley.org.uk/sci/iceage/nas-1975.html