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Venus can't be used as a example of our own conditions. All planets with an atmosphere must have a form of greenhouse otherwise there is no atmosphere.
For obvious reasons Venus very close to the Sun, and with a well established atmosphere it is going to be fairly obvious to scientific community that its greenhouse is going to get excessive.
There is a simple analogy with regards to our solar system both Venus and Mars are out of the Goldilocks zone. it will be expected from any other Exoplanets as well.
The issue of Venus has been used by the non-scientific community as an example of the way the earth is going to go, it is pure speculation and is intended purely just too frightened community into believing their way.
The correct term that should be used for the issues facing earth at the moment would be climate change, and this can be either natural or man-made.
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