Here's a link to the actual study -
http://journals.ametsoc.org/doi/pdf/10.1175/BAMS-D-13-00172.1 - Note the description of the scientists surveyed - "Scientists from two different USDA-NIFA funded projects were surveyed. These are both large-scale projects that seek to increase the resilience of agricultural systems in the face of a changing climate. ..... The scientists surveyed represent a diversity of 9 disciplines including climate scientists, agronomists and social scientists. Together, these scientists are producing and disseminating climate change information to the agricultural sector." Then look at table 1 - the question and possible options. The survey question is "There is
increasing discussion about climate change and its potential impacts. Please select the statement that best reflects your beliefs about climate change." Five possible options are provided -
1) Climate change is occurring, and it is caused mostly by human activities
2) Climate change is occurring, and it is caused more or less equally by natural changes in the environment and human activities
3) Climate change is occurring, and it is caused mostly by natural changes in the environment
4) There is not sufficient evidence to know with certainty whether climate change is occurring or not
5) Climate change is not occurring
Then look at the results in the table.
Points:
1) The scientists surveyed represent a diversity of fields and only a subset are scientists whose primary field of study is climate science. Hence it is not surprising to see somewhat different levels of opinion in this group relative to surveys that look exclusively at climate scientists.
2) The presentation you have provided focuses exclusively on those who believe climate change is "caused mostly by human activities" and not on those who also believe that it is "caused more or less equally by natural changes in the environment and human activities". Both answers indicate a belief/understanding that human activities are contributing to climate change but vary in the magnitude of the relative contribution. I would claim it's more sensible to sum both of these answers together and if you do, you'll get numbers that range from 81-96% amongst the scientist group.
3) The questions and available responses are not the best for determining if the scientists believe that human activities are negatively contributing the climate change. No time scale is provided in the question nor is any specificity of what we mean by "climate change". E.g. much of climate change is seasonal and driven by natural factors. A better question might be something similar to "Do you believe the earth's is significantly warmer than it would have been without human activities?" I'd be willing to bet money that such a question would get a much more uniform response from scientists as it's much more clear cut.
So - IMHO, the story on these survey results is heavily distorted in the above reporting.