It's not that simple. There is a good consensus that global warming is happening. Beyond that, there is no consensus. There are thought to be three general explanations for global warming: greenhouse gases, other effects of civilization (cutting trees, paving over land, etc.), and natural climate swings. We have no idea what portion of global warming each of these explanations is responsible for. If we don't know that, we don't know how much cutting greenhouse gases will help.
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At the end of the article there is a link to a correction stating Felten was not sued, only threatened.
It's not that simple. There is a good consensus that global warming is happening. Beyond that, there is no consensus. There are thought to be three general explanations for global warming: greenhouse gases, other effects of civilization (cutting trees, paving over land, etc.), and natural climate swings. We have no idea what portion of global warming each of these explanations is responsible for. If we don't know that, we don't know how much cutting greenhouse gases will help.