The institute for Energy Policy has no expertise in planetary science and accepts the position of "An Open Letter to Congress from U.S. Scientists on Climate Change" dated Dec 4, 2009.
“Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver. These conclusions are based on multiple independent lines of evidence, and contrary assertions are inconsistent with an objective assessment of the vast body of peer-reviewed science. … If we are to avoid the most severe impacts of climate change, emissions of greenhouse gases must be dramatically reduced.”
We can only assume the effects will be extraordinary.