Global Warming-Do We Understand the Changes?

Reading through the reports from NOAA, National Oceanic & Atmospheric Administration, I became aware of just how little we understand our climate. We appear to be doing a good job of collecting data, but a long way from understanding that data.
It is clear that change is on the way and that it will be good for some and bad for others. Of course this is nothing new, there has always been change and it has helped some and hurt others.
At this point we don't know if the changes caused by

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