Although it is important to examine the consequences of today's actions far into the future, it is important not to confuse far future actions with what is done today. The impact of emissions that are made after 2100 has no bearing on what the world should do for the next 30 or even 100 years.
The world community simply should not support such extreme measures when there are so many other pressing issues at hand. The optimal response to greenhouse gases is to start modestly.
The results of recent research on the impacts of climate change dramatically weaken the case for expensive, near-term abatement programs.