So says a new U.N. report on climate change:

OSLO — Governments may have to extract vast amounts of greenhouse gases from the air by 2100 to achieve a target for limiting global warming, backed by trillion-dollar shifts towards clean energy, a draft U.N. report showed on Wednesday.

This is because we're not at all on tack to keep planetary warming below +3.6 degrees Fahrenheit, which is "seen as a threshold for dangerous floods, heat waves, droughts and rising sea levels."