15. In the short-term, this will help US solar makers. In the long-term, it worsens global warming
By imposing tariffs, it will have the effect of making solar panels more expensive to install in the US, possibly slowing their deployment. As it is, fracking has made natural gas so cheap in the US that renewables are already struggling against cheap natural-gas fired turbines.
While there are many environmental issues associated with Chinese solar panel manufacturing, they pale in comparison to the damage global warming will do. We need to be doing all we can to speed up the installation of wind and solar, not slow it. This is a short-sighted move on the part of the Obama administration, and will ultimately do more harm than good.