Rising carbon emissions through 2100 could lock in 14 to 33 feet of long-term global sea level rise.
The impact would be huge for each of the countries in the G7, but japan would be particularly badly affected.
Extreme carbon cuts could decrease these threats by more than half, reducing the damage.
However, the emissions reductions required for this degree of benefit are far deeper than would be achieved from current Japanese and worldwide national pledges.
Right now, there are five coal plants under construction and another 41 under development in Japan.
And it is unclear how those plans will fit with the world’s recent pledge in Paris to keep global warming under 2°C. In Paris, Japan was a poor performer – electing to keep its weak emission reduction target of 26% from 2013 by 2030, which is inconsistent with 2 degrees and with Japan’s long term goal of an 80% reduction in emissions by 2050.
Moreover, building new coal also means breaking the pledge held in Bavaria in 2015 where leaders committed themselves to the need to “decarbonise the global economy in the course of this century”, which requires immediate action to limit temperature rise as far below 2 degrees as possible.
Image credit: Danny Choo on Flickr