1. The scientists colluded in efforts to thwart Freedom of Information Act requests (across continents no less). They reference deleting data, hiding source code from requests, manipulating data to make it more annoying to use, and attempting to deny requests from people recognized as contributors to specific internet sites. Big brother really is watching you. He’s just not very good at securing his web site.
2. These scientists publicly diminished opposing arguments for lack of being published in peer-reviewed scientific journals. In the background they discussed black-balling journals that did publish opposing views, and preventing opposing views from being published in journals they controlled. They even mention changing the rules midstream in arenas they control to ensure opposing views would not see the light of day. They discuss amongst themselves which scientists can be trusted and who should be excluded from having data because they may not be “predictable”.
3. The scientists expressed concern privately over a lack of increase in global temperatures in the last decade, and the fact that they could not explain this. Publicly they discounted it as simple natural variations. In one instance, data was [apparently] manipulated to hide a decline in temperatures when graphed. Other discussions included ways to discount historic warming trends that inconveniently did not occur during increases in atmospheric CO2.
4. The emails show examples of top scientists working to create public relations messaging with favorable news outlets. It shows them identifying and cataloging, by name and association, people with opposing views. These people are then disparaged in a coordinated fashion via favorable online communities.
What the emails/files don’t do is completely destroy the possibility that global climate change is real. They don’t preclude many studies from being accurate, on either side of the discussion. And they should not be seen as discrediting all science.