In his latest article, James Hansen argues that our current emissions trajectory assumes large-scale extraction of CO2 from the atmosphere in the latter half of this century. This is likely to present an incredibly difficult and expensive burden for our children and grandchildren. From the abstract:
Proposed methods of extraction such as bioenergy with carbon capture and storage (BECCS) or air capture of CO2 imply minimal estimated costs of 104–570 trillion dollars this century, with large risks and uncertain feasibility. Continued high fossil fuel emissions unarguably sentences young people to either a massive, possibly implausible cleanup or growing deleterious climate impacts or both, scenarios that should provide both incentive and obligation for governments to alter energy policies without further delay.