ABC: If governments are serious about the global warming targets they adopted in Paris, scientists say they have two options: eliminating fossil fuels immediately or finding ways to undo their damage to the climate system in the future.
The first is politically impossible - the world is still hooked on using oil, coal and natural gas - which leaves the option of a major cleanup of the atmosphere later this century.
Yet the landmark Paris Agreement, adopted by 195 countries on Dec. 12, makes no reference...